Controller Area Network (CAN) - Lancer Evolution: Diagnosis Mitsubishi Lancer X рестайлинг

TEST EQUIPMENT

EQUIPMENT REFERENCE Test equipment Name Use Digital multimeter Checking CAN bus circuit (for resistance and voltage measurements)

EXPLANATION ABOUT THE SCAN TOOL (M.U.T.-III) CAN BUS DIAGNOSTICS

Scan tool MB991958 CAN bus diagnostics carries out the two checks below automatically, and then displays current condition of the CAN bus lines according to the check results.

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1. Scan tool CAN bus diagnostics Scan tool MB991958 diagnoses CAN bus lines in accordance with the following strategy. NOTE: After you determine whether the CAN-C lines are in good condition, then determine whether the CAN-B lines are in good condition. Then confirm each judgment result on the scan tool screen. Check that the ETACS-ECU sets a diagnostic trouble code. You can narrow down the points to be diagnosed by confirming an ETACS-ECU diagnostic trouble code. Checking the communication condition of ECUs Scan tool MB991958 narrows down troubles in circuit by itself. Its strategies are as follows. Reference circuit POSSIBLE TROUBLE SPOT REFERENCE ECU which cannot communicate with the scan tool Possible trouble spot Logic for narrowing down trouble spot ETACS-ECU and all ECUs CAN bus line (h) and power supply system to ETACS-ECU The ETACS-ECU and the other ECUs use the CAN bus line (h) when they communicate with scan tool MB991958. Since none of the ETACS-ECU and the other ECUs can communicate with scan tool MB991958, CAN bus line (h) or the power supply circuit to the ETACS-ECU may be faulty. ECU A CAN bus line (a) and power supply system to ECU A ECU A communicates with the scan tool MB991958 via CAN bus lines (a) and (b). Scan tool MB991958 judges that CAN bus line (b) is normal, because it can communicate with other ECUs. Possible trouble may be present in CAN bus line (a) or the power supply system to ECU A. ECU C CAN bus line (g) and power supply system to ECU C The ECU C communicates with scan tool MB991958 via CAN bus lines (b), (c), (d) and (g). Scan tool MB991958 judges that CAN bus lines (b), (c) and (d) are normal, because it can communicate with ECUs B and D. Possible trouble may be present in CAN bus line (g) or the power supply system to ECU C. ECU C and ECU D Trouble in CAN bus line (d) ECUs C and D communicate with scan tool MB991958 via CAN bus lines (b), (c), (d), (e) and (g). Scan tool MB991958 judges that CAN bus lines (b) and (c) are normal, because it can communicate with ECU B. Possible trouble may be present in CAN bus line (d), (e) or (g) or the power supply system to ECU C and ECU D. CAN bus line (d) is shared by ECUs C and D when they communicate with scan tool MB991958, so CAN bus line (d) is suspected as ultimate cause. CAN bus line (g) or (e) and power supply systems to ECU C or D are also suspected as second cause. ECU B and ECU D CAN bus line (e) or (f) or power supply system to ECU B or D ECUs B and D communicate with scan tool MB991958 via CAN bus lines (b), (c), (d), (e) and (f). Scan tool MB991958 judges that CAN bus lines (b), (c) and (d) are normal, because it can communicate with ECU C. Possible trouble may be present in CAN bus line (f) or (e) or the power supply system to ECU B or ECU D. All ECU (except ETACS-ECU) CAN bus line (b) The other ECUs except the ETACS-ECU use CAN bus lines (b) and (h) when they communicate with scan tool MB991958. It must be assumed that CAN bus line (b) is defective since the ETACS-ECU can communicate with scan tool MB991958.
2. Pinpoint possible trouble spot according to diagnostic trouble code If diagnostic trouble code related to CAN communication is set as past trouble, isolate opens as described below. NOTE: If you pinpoint trouble spot according to diagnostic trouble code, you should use time-out diagnostic trouble code. Diagnostic trouble code related to failure information is set when the data to be set contains an error, so CAN bus line itself is probably normal. NOTE: Time-out diagnostic trouble codes are stored in each ECU memory individually. Therefore, it is possible that these diagnostic trouble codes have not been set simultaneously. If the trouble spot cannot be found when you diagnose by judging from multiple diagnostic trouble codes, check the communication lines between each ECU. POSSIBLE TROUBLE SPOT REFERENCE Diagnostic trouble code to be set Possible trouble spot Logic for narrowing down trouble spot Time-out diagnostic trouble code associated with ECU D is stored in ECU A, ECU B and ECU C. Trouble in CAN bus line (e) and power supply system to ECU D When time-out diagnostic trouble code associated with ECU D is stored in ECU A, B and C, or time-out diagnostic trouble code associated with ECUs A, B and C is stored in ECU D, or "bus off" diagnostic trouble code is stored in ECU D, CAN bus line (e) is suspected. When diagnostic trouble code is not stored in ECU D, the power supply to ECU D is suspected. Time-out diagnostic trouble code associated with ECUs A, B and C is stored in ECU D. "Bus off" diagnostic trouble code is stored in ECU D. Time-out diagnostic trouble code associated with ECU A is stored in ECUs B, C and D. Trouble in CAN bus line (a) or (c) and power supply system to ECU A. When time-out diagnostic trouble code associated with ECU A is stored in ECUs B, C and D, or time-out diagnostic trouble code associated with ECUs B, C and D is stored in ECU A, or "bus off" diagnostic trouble code is stored in ECU A, CAN bus line (a) or (c) is suspected. When diagnostic trouble code is not stored in ECU A, the power supply to ECU A is suspected. Time-out diagnostic trouble code associated with ECUs B, C and D is stored in ECU A. "Bus off" diagnostic trouble code is stored in ECU A. Time-out diagnostic trouble codes associated with ECUs C and D are stored in ECU A and ECU B. Trouble in CAN bus line (d) If time-out diagnostic trouble codes associated with ECUs C and D are stored in ECUs A and B, or time-out codes associated with ECUs A and B are stored in ECUs C and D, CAN bus line (d) is suspected. CAN bus line (g) or (e) and power supply systems to ECU C or D are also suspected as second cause. Time-out diagnostic trouble codes associated with ECUs A and B are stored in ECU C and ECU D. Time-out diagnostic trouble codes associated with ECUs A, B, C and D are stored in ETACS-ECU. Trouble in CAN bus line (b) It must be assumed that a fault was present in CAN bus line (b) when the ETACS-ECU has set a time-out diagnostic trouble code for ECU A, B, C or D. Time-out diagnostic trouble codes associated with ETACS-ECU is stored in ECU A, B, C and ECU D.

CAN BUS DIAGNOSTICS TABLE

This diagnosis applies only to the CAN bus lines. If a different system is defective, proceed to the applicable diagnosis section for each system. Observe the diagnosis procedure below only when the CAN bus line is defective.

SCAN TOOL REFERENCE Scan tool screen (The ECUs that are not adopted are not displayed.) Diagnosis detail Reference Comment Short circuit to battery in red displayed area is estimated. Diagnosis Item 1 Diagnose when the scan tool cannot receive the data sent by ETACS-ECU. DIAGNOSTIC ITEM 1: DIAGNOSE WHEN THE SCAN TOOL CANNOT RECEIVE THE DATA SENT BY ETACS-ECU. Grounding in red displayed area is estimated. Diagnosis Item 2 Malfunction of the ETACS-ECU. DIAGNOSTIC ITEM 2: MALFUNCTION OF THE ETACS-ECU. CAN-C: A bus-off failure is present in the gateway ECU. Diagnosis Item 3 Abnormal short between the CAN-C bus lines. DIAGNOSTIC ITEM 3: ABNORMAL SHORT BETWEEN THE CAN-C BUS LINES. CAN-C: Grounding in red displayed area is estimated Diagnosis Item 4 Diagnose shorts in the ground to CAN-C bus line. DIAGNOSTIC ITEM 4: DIAGNOSE SHORTS IN THE GROUND TO CAN-C BUS LINE. CAN-C: Short circuit to battery in red displayed area is estimated Diagnosis Item 5 Diagnose shorts in the power supply to CAN-C bus line. DIAGNOSTIC ITEM 5: DIAGNOSE SHORTS IN THE POWER SUPPLY TO CAN-C BUS LINE. CAN-C: Disconnection in red displayed area is estimated. Diagnosis Item 6 Diagnose when the scan tool cannot receive the data sent by AWC-ECU. DIAGNOSTIC ITEM 6: DIAGNOSE WHEN THE SCAN TOOL CANNOT RECEIVE THE DATA SENT BY AWC-ECU. CAN-C: Disconnection in red displayed area is estimated. Diagnosis Item 7 Diagnose when the scan tool cannot receive the data sent by steering wheel sensor. DIAGNOSTIC ITEM 7: DIAGNOSE WHEN THE SCAN TOOL CANNOT RECEIVE THE DATA SENT BY STEERING WHEEL SENSOR. CAN-C: Disconnection in red displayed area is estimated. Diagnosis Item 8 Diagnose when the scan tool cannot receive the data sent by shift lever. DIAGNOSTIC ITEM 8: DIAGNOSE WHEN THE SCAN TOOL CANNOT RECEIVE THE DATA SENT BY SHIFT LEVER. CAN-C: Disconnection in red displayed area is estimated. Diagnosis Item 9 Diagnose when the scan tool cannot receive the data sent by ASC-ECU. DIAGNOSTIC ITEM 9: DIAGNOSE WHEN THE SCAN TOOL CANNOT RECEIVE THE DATA SENT BY ASC-ECU. CAN-C: Disconnection in red displayed area is estimated. Diagnosis Item 10 Diagnose when the scan tool cannot receive the data sent by ECM. DIAGNOSTIC ITEM 10: DIAGNOSE WHEN THE SCAN TOOL CANNOT RECEIVE THE DATA SENT BY ECM. CAN-C: Disconnection in red displayed area is estimated. Diagnosis Item 11 Diagnose when the scan tool cannot receive the data sent by TC-SST-ECU. DIAGNOSTIC ITEM 11: DIAGNOSE WHEN THE SCAN TOOL CANNOT RECEIVE THE DATA SENT BY TC-SST-ECU. CAN-C: Disconnection in red displayed area is estimated. Diagnosis Item 12 Diagnose the lines between the ETACS-ECU and joint connector (CAN2). DIAGNOSTIC ITEM 12: DIAGNOSE THE LINES BETWEEN THE ETACS-ECU AND JOINT CONNECTOR (CAN2). CAN-C: Disconnection in red displayed area is estimated. Diagnosis Item 13 Diagnose the lines between joint connector (CAN2) and joint connector (CAN3). DIAGNOSTIC ITEM 13: DIAGNOSE THE LINES BETWEEN JOINT CONNECTOR (CAN2) AND JOINT CONNECTOR (CAN3). CAN-C: Disconnection in red displayed area is estimated. Diagnosis Item 14 Diagnose the lines between joint connector (CAN3) and joint connector (CAN 4). DIAGNOSTIC ITEM 14: DIAGNOSE THE LINES BETWEEN JOINT CONNECTOR (CAN3) AND JOINT CONNECTOR (CAN4). CAN-B: Disconnection in red displayed area is estimated. Diagnosis Item 15 Diagnose when the scan tool cannot receive the data sent by KOS-ECU. DIAGNOSTIC ITEM 15: DIAGNOSE WHEN THE SCAN TOOL CANNOT RECEIVE THE DATA SENT BY KOS-ECU. Diagnosis Item 16 Diagnose when the scan tool cannot receive the data sent by WCM. DIAGNOSTIC ITEM 16: DIAGNOSE WHEN THE SCAN TOOL CANNOT RECEIVE THE DATA SENT BY WCM. CAN-B: Disconnection in red displayed area is estimated. Diagnosis Item 17 Diagnose when the scan tool cannot receive the data sent by SRS-ECU. DIAGNOSTIC ITEM 17: DIAGNOSE WHEN THE SCAN TOOL CANNOT RECEIVE THE DATA SENT BY SRS-ECU. CAN-B: Disconnection in red displayed area is estimated. Diagnosis Item 18 Diagnose when the scan tool cannot receive the data sent by occupant classification-ECU. DIAGNOSTIC ITEM 18: DIAGNOSE WHEN THE SCAN TOOL CANNOT RECEIVE THE DATA SENT BY OCCUPANT CLASSIFICATION-ECU. CAN-B: Disconnection in red displayed area is estimated. Diagnosis Item 19 Diagnose when the scan tool cannot receive the data sent by A/C-ECU or heater control unit . DIAGNOSTIC ITEM 19: DIAGNOSE WHEN THE SCAN TOOL CANNOT RECEIVE THE DATA SENT BY A/C-ECU OR HEATER CONTROL UNIT . CAN-B: Disconnection in red displayed area is estimated. Diagnosis Item 20 Diagnose when the scan tool cannot receive the data sent by radio and CD player or CD changer. DIAGNOSTIC ITEM 20: DIAGNOSE WHEN THE SCAN TOOL CANNOT RECEIVE THE DATA SENT BY RADIO AND CD PLAYER OR CD CHANGER. CAN-B: Disconnection in red displayed area is estimated. Diagnosis Item 21 Diagnose when the scan tool cannot receive the data sent by CAN box unit. DIAGNOSTIC ITEM 21: DIAGNOSE WHEN THE SCAN TOOL CANNOT RECEIVE THE DATA SENT BY CAN BOX UNIT. CAN-B: Disconnection in red displayed area is estimated. Diagnosis Item 22 Diagnose when the scan tool cannot receive the data sent by satellite radio tuner. DIAGNOSTIC ITEM 22: DIAGNOSE WHEN THE SCAN TOOL CANNOT RECEIVE THE DATA SENT BY SATELLITE RADIO TUNER. CAN-B: Disconnection in red displayed area is estimated. Diagnosis Item 23 Diagnose when the scan tool cannot receive the data sent by combination meter. DIAGNOSTIC ITEM 23: DIAGNOSE WHEN THE SCAN TOOL CANNOT RECEIVE THE DATA SENT BY COMBINATION METER. CAN-B: A failure in the red section, or a bus-off failure is present in the gateway ECU. Diagnosis Item 24 Short to power supply or ground in both CAN_H and CAN_L lines of the CAN-B bus lines. DIAGNOSTIC ITEM 24: SHORT TO POWER SUPPLY OR GROUND IN BOTH CAN_H AND CAN_L LINES OF THE CAN-B BUS LINES. CAN-B: Disconnection in red displayed area is estimated. Diagnosis Item 25 Diagnose the ETACS-ECU, joint connector (CAN1) or lines between ETACS-ECU and joint connector (CAN1). DIAGNOSTIC ITEM 25: DIAGNOSE THE ETACS-ECU, JOINT CONNECTOR (CAN1) OR LINES BETWEEN ETACS-ECU AND JOINT CONNECTOR (CAN1). CAN-B: Disconnection in red displayed area is estimated. Diagnosis Item 26 Short to power supply or ground, open circuit or line-to-line short in the CAN-B bus lines. DIAGNOSTIC ITEM 26: SHORT TO POWER SUPPLY OR GROUND, OPEN CIRCUIT OR LINE-TO-LINE SHORT IN THE CAN-B BUS LINES.

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CONNECTOR SPECIFICATION

DIAGNOSTIC ITEM 1: Diagnose When The Scan Tool Cannot Receive The Data Sent By ETACS-ECU

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TROUBLE JUDGMENT CONDITIONS

If a communication flag is not set for the ETACS-ECU, the scan tool determines that there is a failure.

TROUBLESHOOTING HINTS

1. Malfunction of the connector (data link connector or ETACS-ECU connector improperly connected)
2. Malfunction of the wiring harness (open circuit, short to ground, short to power supply between the data link connector and the ETACS-ECU connector, line-to-line short, or power supply to the ETACS-ECU)
3. Malfunction of ETACS-ECU

DIAGNOSIS

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

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1. STEP 1. Check data link connector C-40 and ETACS-ECU connector C-301 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are data link connector C-40 and ETACS-ECU connector C-301 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between data link connector C-40 and ETACS-ECU connector C-301 for open circuit. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect the scan tool and ETACS-ECU connector C-301, and check the wiring harness. Check the wiring harness between data link connector C-40 (terminal 6) and ETACS-ECU connector C-301 (terminal 5) OK: Continuity exists (2 ohms or less) Check the wiring harness between data link connector C-40 (terminal 14) and ETACS-ECU connector C-301 (terminal 4) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between data link connector C-40 and ETACS-ECU connector C-301 in good condition? YES: Go to Step 3. NO: Repair the wiring harness between data link connector C-40 and ETACS-ECU connector C-301.
3. STEP 3. Check the wiring harness between data link connector C-40 and ETACS-ECU connector C-301 for a short to ground. Measure the resistance at data link connector C-40. CAUTION: Disconnect the negative battery terminal. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect the scan tool and ETACS-ECU connector C-301, and measure the resistance at the wiring harness side of data link connector C-40. Measure the resistance between data link connector terminal 6 and body ground. OK: 1 kohms or more Measure the resistance between data link connector terminal 14 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 4. NO: Repair the wiring harness between data link connector C-40 and ETACS-ECU connector C-301.
4. STEP 4. Check the wiring harness between data link connector C-40 and ETACS-ECU connector C-301 for a short to the power supply. Measure the voltage at data link connector C-40. Disconnect the scan tool and ETACS-ECU connector C-301, and measure the resistance at the wiring harness side of data link connector C-40. Turn the ignition switch to the "ON" position. Measure the voltage between data link connector terminal 6 and body ground. OK: 1 V or less Measure the voltage between data link connector terminal 14 and body ground. OK: 1 V or less Q: Do all the voltage measure 1 V or less? YES: Go to Step 5. NO: Repair the wiring harness between data link connector C-40 and ETACS-ECU connector C-301.
5. STEP 5. Check the wiring harness between data link connector C-40 and ETACS-ECU connector C-301 for line-to-line short. Measure the resistance at data link connector C-40. Disconnect the scan tool and ETACS-ECU connector C-301, and measure the resistance at the wiring harness side of data link connector C-40. Measure the resistance between data link connector terminal 6 and 14. OK: No continuity Q: Is the check result normal? YES: Go to Step 6. NO: Repair the wiring harness between data link connector C-40 and ETACS-ECU connector C-301.
6. STEP 6. Using scan tool MB991958, diagnose the CAN bus line. CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool screen is as shown in the illustrations below. Q: Does the scan tool screen correspond to the illustration? YES: The trouble can be an intermittent malfunction (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTION»(ref-592586-S21436341472014011000000) ). NO: Replace the ETACS-ECU.

DIAGNOSTIC ITEM 2: Malfunction Of The ETACS-ECU

TROUBLE JUDGEMENT CONDITIONS

If no communication flags are set for the ECUs (on the CAN-B or CAN-C lines) other than the ETACS-ECU, the ETACS-ECU determines that there is a failure.

TROUBLESHOOTING HINT

Malfunction of the ETACS-ECU

Required Special Tools

1. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A

Recheck for other system diagnostic trouble code.

Check whether ETACS-ECU-related DTC is set.

1. Connect scan tool MB991958 to the data link connector.
2. Turn the ignition switch to the "ON" position.
3. Check if the DTC is set.
4. Turn the ignition switch to the "LOCK" (OFF) position.

Q: Is the DTC set?

1. YES (The DTC other than the U code is set.): Troubleshoot the ETACS-ECU. Refer to «DIAGNOSTIC TROUBLE CODE CHART»(ref-592588-S03824957682014011000000) .
2. YES (Only U-code DTC is set.): Check the power supply circuit of the ETACS-ECU. Refer to «TROUBLE SYMPTOM CHART»(ref-592588-S16983022202014011000000) .
3. NO (The DTC is not set.): Check the power supply circuit of the ETACS-ECU. Refer to «TROUBLE SYMPTOM CHART»(ref-592588-S16983022202014011000000) .

DIAGNOSTIC ITEM 3: Abnormal Short Between The CAN-C Bus Lines

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If only diagnostic trouble code U0001 is set, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector (joint connectors or ECU connectors improperly connected)
2. Malfunction of the wiring harness (line-to-line short in the CAN-C main or sub bus lines)
3. Malfunction of the ECU (ECU on CAN-C lines failed)

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A
4. MB992110: Power plant ECU check harness
5. MB991997: ASC Check Harness

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1. STEP 1. Check joint connector (CAN2) C-104, joint connector (CAN3) C-127 and joint connector (CAN4) A-14 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN2) C-104, joint connector (CAN3) C-127 and joint connector (CAN4) A-14 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN2) C-104 and steering wheel senor connector C-209 for line-to-line short. Measure the resistance at joint connector (CAN2) C-104. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN2), and check that there is continuity at the harness side of joint connector (CAN2). Check that there is continuity between joint connector (CAN2) terminals 10 and 21. OK: No continuity Q: Is the check result normal? YES: Go to Step 3. NO: Go to Step 11 .
3. STEP 3. Check the wiring harness between joint connector (CAN2) C-104 and S-AWC-ECU connector C-46 for line-to-line short. Measure the resistance at joint connector (CAN2) C-104. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN2), and check that there is continuity at the harness side of joint connector (CAN2). Check that there is continuity between joint connector (CAN2) terminals 8 and 19. OK: No continuity Q: Is the check result normal? YES: Go to Step 4. NO: Go to Step 12 .
4. STEP 4. Check the wiring harness between joint connector (CAN2) C-104 and ETACS-ECU connector C-301 for line-to-line short. Measure the resistance at joint connector (CAN2) C-104. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN2), and check that there is continuity at the harness side of joint connector (CAN2). Check that there is continuity between joint connector (CAN2) terminals 11 and 22. OK: 120 ± 20 ohms Q: Is the check result normal? YES: Go to Step 5. NO: Go to Step 13 .
5. STEP 5. Check the wiring harness between joint connector (CAN3) C-127 and ASC-ECU connector A-05 for line-to-line short. Measure the resistance at joint connector (CAN3) C-127. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN3), and check that there is continuity at the harness side of joint connector (CAN3). Check that there is continuity between joint connector (CAN3) terminals 9 and 20. OK: No continuity Q: Is the check result normal? YES : Go to Step 6. YES : Go to Step 7 . NO: Go to Step 14 .
6. STEP 6. Check the wiring harness between joint connector (CAN3) C-127 and ECM connector B-10 for line-to-line short. Measure the resistance at joint connector (CAN3) C-127. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN3), and check that there is continuity at the harness side of joint connector (CAN3). Check that there is continuity between joint connector (CAN3) terminals 10 and 21. OK: 120 ± 20 ohms Q: Is the check result normal? YES: Check intermediate connector C-130, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN2) C-104 and joint connector (CAN3) C-127. NO: Go to Step 15 .
7. STEP 7. Check the wiring harness between joint connector (CAN3) C-127 and shift lever connector for line-to-line short. Measure the resistance at joint connector (CAN3) C-127. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN3), and check that there is continuity at the harness side of joint connector (CAN3). Check that there is continuity between joint connector (CAN3) terminals 8 and 19. OK: No continuity Q: Is the check result normal? YES: Go to Step 8. NO: Go to Step 16 .
8. STEP 8. Check the wiring harness between joint connector (CAN4) A-14 and ECM connector B-10 for line-to-line short. Measure the resistance at joint connector (CAN4) A-14. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN4), and check that there is continuity at the harness side of joint connector (CAN4). Check that there is continuity between joint connector (CAN4) terminals 6 and 19. OK: No continuity Q: Is the check result normal? YES: Go to Step 9. NO: Go to Step 15 .
9. STEP 9. Check the wiring harness between joint connector (CAN4) A-14 and transaxle assembly connector B-107 for line-to-line short. Measure the resistance at joint connector (CAN4) A-14. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN4), and check that there is continuity at the harness side of joint connector (CAN4). Check that there is continuity between joint connector (CAN4) terminals 7 and 20. OK: No continuity Q: Is the check result normal? YES: Go to Step 10. NO: Go to Step 17 .
10. STEP 10. Check the wiring harness between joint connector (CAN3) C-127 and joint connector (CAN2) C-104 for line-to-line short. Measure the resistance at joint connector (CAN3) C-127. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN3) and Disconnect joint connector (CAN2), and check that there is continuity at the harness side of joint connector (CAN3). Check that there is continuity between joint connector (CAN3) terminals 11 and 22. OK: No continuity Q: Is the check result normal? YES: Check intermediate connector A-13, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN3) C-127 and joint connector (CAN4) A-14. NO: Check intermediate connector C-130, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN2) C-104 and joint connector (CAN3) C-127.
11. STEP 11. Using scan tool MB991958, diagnose the CAN bus line. (checking the steering wheel sensor for internal short) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect steering wheel sensor connector C-209. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between steering wheel sensor connector C-209 and joint connector (CAN2) C-104. NO: Check steering wheel sensor connector C-209, and repair if necessary. If the steering wheel sensor connector is in good condition, replace the steering wheel sensor.
12. STEP 12. Using scan tool MB991958, diagnose the CAN bus line. (checking the S-AWC-ECU for internal short) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect S-AWC-ECU connector C-46. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between S-AWC-ECU connector C-46 and joint connector (CAN2) C-104. NO: Check S-AWC-ECU connector C-46, and repair if necessary. If the S-AWC-ECU connector is in good condition, replace the S-AWC-ECU.
13. STEP 13. Check the wiring harness between joint connector (CAN2) C-104 and ETACS-ECU connector C-301 for line-to-line short. Measure the resistance at joint connector (CAN2) C-104. Disconnect joint connector (CAN2) and ETACS-ECU connector, and check that there is continuity at the harness side of joint connector (CAN2). Check that there is continuity between joint connector (CAN2) terminals 11 and 22. OK: No continuity Q: Is the check result normal? YES: Go to Step 18 . NO: Repair the wiring harness between ETACS-ECU connector C-301 and joint connector (CAN2) C-104.
14. STEP 14. Using scan tool MB991958, diagnose the CAN bus line. (checking the ASC-ECU for internal short) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect ASC-ECU connector A-05. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between ASC-ECU connector A-05 and joint connector (CAN3) C-127. NO: Check ASC-ECU connector A-05, and repair if necessary. If the ASC-ECU connector is in good condition, replace the ASC-ECU.
15. STEP 15. Using scan tool MB991958, diagnose the CAN bus line. (checking the ECM for internal short) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect ECM connector B-10. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between ECM connector B-10 and joint connector (CAN3) C-127 , or check intermediate connector A-13, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between ECM connector B-10 and joint connector (CAN4) A-14 . NO: Check ECM connector B-10, and repair if necessary. If the ECM connector is in good condition, replace the ECM.
16. STEP 16. Using scan tool MB991958, diagnose the CAN bus line. (checking the shift lever for internal short) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect shift lever connector C-27. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between shift lever connector C-27 and joint connector (CAN3) C-127. NO: Check shift lever connector C-27, and repair if necessary. If the shift lever connector is in good condition, replace the shift lever.
17. STEP 17. Using scan tool MB991958, diagnose the CAN bus line. (checking the TC-SST-ECU for internal short) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect transaxle assembly connector B-107. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between transaxle assembly connector B-107 and joint connector (CAN4) A-14. NO: Check transaxle assembly connector B-107, and repair if necessary. If the transaxle assembly connector is in good condition, replace the transaxle assembly
18. STEP 18. Using scan tool MB991958, diagnose the CAN bus line. CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool screen is as shown in the illustrations below. Q: Does the scan tool screen correspond to the illustration? YES: The trouble can be an intermittent malfunction (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTION»(ref-592586-S21436341472014011000000) ). NO: Check ETACS-ECU connector C-301, and repair if necessary. If the ETACS-ECU connector is in good condition, replace the ETACS-ECU.

If DTC U1120 is set, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector (short to ground inside connector)
2. Malfunction of the wiring harness (short to ground in the CAN-C main or sub bus lines)
3. Malfunction of the ECU (ETACS-ECU, or ECUs on CAN-C lines failed)

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A
4. MB992110: Power plant ECU check harness
5. MB991997: ASC Check Harness

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Scheme 583

1. STEP 1. Check the wiring harness between joint connector (CAN2) C-104 and steering wheel sensor connector C-209 for a short to ground. Measure the resistance at joint connector (CAN2) C-104. CAUTION: Disconnect the negative battery terminal. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN2), and measure the resistance at the wiring harness side of joint connector (CAN2). Measure the resistance between joint connector (CAN2) terminal 10 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN2) terminal 21 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 2. NO: Go to Step 10 .
2. STEP 2. Check the wiring harness between joint connector (CAN2) C-104 and AWC-ECU connector C-46 for a short to ground. Measure the resistance at joint connector (CAN2) C-104. CAUTION: Disconnect the negative battery terminal. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN2), and measure the resistance at the wiring harness side of joint connector (CAN2). Measure the resistance between joint connector (CAN2) terminal 8 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN2) terminal 19 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 3. NO: Go to Step 11 .
3. STEP 3. Check the wiring harness between joint connector (CAN2) C-104 and ETACS-ECU connector C-301 for a short to ground. Measure the resistance at joint connector (CAN2) C-104. CAUTION: Disconnect the negative battery terminal. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN2), and measure the resistance at the wiring harness side of joint connector (CAN2). Measure the resistance between joint connector (CAN2) terminal 11 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN2) terminal 22 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 4. NO: Go to Step 12 .
4. STEP 4. Check the wiring harness between joint connector (CAN3) C-127 and ASC-ECU connector A-05 for a short to ground. Measure the resistance at joint connector (CAN3) C-127. CAUTION: Disconnect the negative battery terminal. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN3), and measure the resistance at the wiring harness side of joint connector (CAN3). Measure the resistance between joint connector (CAN3) terminal 9 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN3) terminal 20 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES : Go to Step 5. YES : Go to Step 6 . NO: Go to Step 13 .
5. STEP 5. Check the wiring harness between joint connector (CAN3) C-127 and ECM connector B-10 for a short to ground. Measure the resistance at joint connector (CAN3) C-127. CAUTION: Disconnect the negative battery terminal. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN3), and measure the resistance at the wiring harness side of joint connector (CAN3). Measure the resistance between joint connector (CAN3) terminal 10 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN3) terminal 21 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Check intermediate connector C-130, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN2) C-104 and joint connector (CAN3) C-127. NO: Go to Step 14 .
6. STEP 6. Check the wiring harness between joint connector (CAN3) C-127 and shift lever connector C-27 for a short to ground. Measure the resistance at joint connector (CAN3) C-127. CAUTION: Disconnect the negative battery terminal. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN3), and measure the resistance at the wiring harness side of joint connector (CAN3). Measure the resistance between joint connector (CAN3) terminal 8 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN3) terminal 19 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 7. NO: Go to Step 15 .
7. STEP 7. Check the wiring harness between joint connector (CAN4) A-14 and ECM connector B-10 for a short to ground. Measure the resistance at joint connector (CAN4) A-14. CAUTION: Disconnect the negative battery terminal. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN4), and measure the resistance at the wiring harness side of joint connector (CAN4). Measure the resistance between joint connector (CAN4) terminal 6 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN4) terminal 19 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 8. NO: Go to Step 14 .
8. STEP 8. Check the wiring harness between joint connector (CAN4) A-14 and transaxle assembly connector B-107 for a short to ground. Measure the resistance at joint connector (CAN4) A-14. CAUTION: Disconnect the negative battery terminal. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN4), and measure the resistance at the wiring harness side of joint connector (CAN4). Measure the resistance between joint connector (CAN4) terminal 7 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN4) terminal 20 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 9. NO: Go to Step 16 .
9. STEP 9. Check the wiring harness between joint connector (CAN3) C-127 and joint connector (CAN2) C-104 for a short to ground. Measure the resistance at joint connector (CAN3) C-127. CAUTION: Disconnect the negative battery terminal. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN3), and measure the resistance at the wiring harness side of joint connector (CAN3). Measure the resistance between joint connector (CAN3) terminal 11 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN3) terminal 22 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Check intermediate connector A-13, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN3) C-127 and joint connector (CAN4) A-14. NO: Check intermediate connector C-130, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN3) C-127 and joint connector (CAN2) C-104.
10. STEP 10. Using scan tool MB991958, diagnose the CAN bus line. (checking the steering wheel sensor for internal short to ground) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect steering wheel sensor connector C-209. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between steering wheel sensor connector C-209 and joint connector (CAN2) C-104. NO: Check steering wheel sensor connector C-209, and repair if necessary. If the steering wheel sensor connector is in good condition, replace the steering wheel sensor.
11. STEP 11. Using scan tool MB991958, diagnose the CAN bus line. (checking the AWC-ECU for internal short to ground) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect AWC-ECU connector C-46. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between AWC-ECU connector C-46 and joint connector (CAN2) C-104. NO: Check AWC-ECU connector C-46, and repair if necessary. If the AWC-ECU connector is in good condition, replace the AWC-ECU.
12. STEP 12. Check the wiring harness between joint connector (CAN2) C-104 and ETACS-ECU connector C-301 for a short to ground. CAUTION: Disconnect the negative battery terminal. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect ETACS-ECU connector and joint connector (CAN2), and measure at the wiring harness side. Measure the resistance between joint connector (CAN2) terminal 11 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN2) terminal 22 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Check ETACS-ECU connector C-301, and repair if necessary. If the ETACS-ECU connector is in good condition, replace the ETACS-ECU. NO: Repair the wiring harness between ETACS-ECU connector C-301 and joint connector (CAN2) C-104.
13. STEP 13. Using scan tool MB991958, diagnose the CAN bus line. (checking the ASC-ECU for internal short to ground) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect ASC-ECU connector A-05. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between ASC-ECU connector A-05 and joint connector (CAN3) C-127. NO: Check ASC-ECU connector A-05, and repair if necessary. If the ASC-ECU connector is in good condition, replace the ASC-ECU.
14. STEP 14. Using scan tool MB991958, diagnose the CAN bus line. (checking the ECM for internal short to ground) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect ECM connector B-10. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between ECM connector B-10 and joint connector (CAN3) C-127 , or check intermediate connector A-13, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between ECM connector B-10 and joint connector (CAN4) A-14 . NO: Check ECM connector B-10, and repair if necessary. If the ECM connector is in good condition, replace the ECM.
15. STEP 15. Using scan tool MB991958, diagnose the CAN bus line. (checking the shift lever for internal short to ground) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect shift lever connector C-27. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between shift lever connector C-27 and joint connector (CAN3) C-127. NO: Check shift lever connector C-27, and repair if necessary. If the shift lever connector is in good condition, replace the shift lever.
16. STEP 16. Using scan tool MB991958, diagnose the CAN bus line. (checking the TC-SST-ECU for internal short to ground) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect transaxle assembly connector B-107. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between transaxle assembly connector B-107 and joint connector (CAN4) A-14. NO: Check transaxle assembly connector B-107, and repair if necessary. If the transaxle assembly connector is in good condition, replace the transaxle assembly.

The wiring harness wire or connectors may have loose, corroded, or damage terminals, or terminals pushed back in the connector, or an ECU may be defective.

1. Malfunction of the connector (short to power supply in connector)
2. Malfunction of the wiring harness (short to power supply in the CAN-C main or sub bus lines)
3. Malfunction of the ECU (ETACS-ECU, or ECUs on CAN-C lines failed)

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991958: Scan Tool (M.U.T.-III Sub Assembly) MB991824: Vehicle Communication Interface (V.C.I.) MB991827: M.U.T.-III USB Cable MB991910: M.U.T.-III Main Harness A
4. MB992110: Power plant ECU check harness
5. MB991997: ASC Check Harness

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Scheme 601

1. STEP 1. Check the wiring harness between joint connector (CAN2) C-104 and steering wheel sensor connector C-209 for a short to power supply. Measure the voltage at joint connector (CAN2) C-104. Disconnect joint connector (CAN2), and measure the voltage at the wiring harness side of joint connector (CAN2). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN2) terminal 10 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN2) terminal 21 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 2. NO: Go to Step 10 .
2. STEP 2. Check the wiring harness between joint connector (CAN2) C-104 and AWC-ECU connector C-46 for a short to power supply. Measure the voltage at joint connector (CAN2) C-104. Disconnect joint connector (CAN2), and measure the voltage at the wiring harness side of joint connector (CAN2). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN2) terminal 8 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN2) terminal 19 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 3. NO: Go to Step 11 .
3. STEP 3. Check the wiring harness between joint connector (CAN2) C-104 and ETACS-ECU connector C-301 for a short to power supply. Measure the voltage at joint connector (CAN2) C-104. Disconnect joint connector (CAN2), and measure the voltage at the wiring harness side of joint connector (CAN2). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN2) terminal 11 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN2) terminal 22 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 4. NO: Go to Step 12 .
4. STEP 4. Check the wiring harness between joint connector (CAN3) C-127 and ASC-ECU connector A-05 for a short to power supply. Measure the voltage at joint connector (CAN3) C-127. Disconnect joint connector (CAN3), and measure the voltage at the wiring harness side of joint connector (CAN3). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN3) terminal 9 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN3) terminal 20 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES : Go to Step 5. YES : Go to Step 6 . NO: Go to Step 13 .
5. STEP 5. Check the wiring harness between joint connector (CAN3) C-127 and ECM connector B-10 for a short to power supply. Measure the voltage at joint connector (CAN3) C-127. Disconnect joint connector (CAN3), and measure the voltage at the wiring harness side of joint connector (CAN3). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN3) terminal 10 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN3) terminal 21 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Check intermediate connector C-130, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN2) C-104 and joint connector (CAN3) C-127. NO: Go to Step 14 .
6. STEP 6. Check the wiring harness between joint connector (CAN3) C-127 and shift lever connector C-27 for a short to power supply. Measure the voltage at joint connector (CAN3) C-127. Disconnect joint connector (CAN3), and measure the voltage at the wiring harness side of joint connector (CAN3). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN3) terminal 8 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN3) terminal 19 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 7. NO: Go to Step 15 .
7. STEP 7. Check the wiring harness between joint connector (CAN4) A-14 and ECM connector B-10 for a short to power supply. Measure the voltage at joint connector (CAN4) A-14. Disconnect joint connector (CAN4), and measure the voltage at the wiring harness side of joint connector (CAN4). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN4) terminal 6 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN4) terminal 19 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 8. NO: Go to Step 14 .
8. STEP 8. Check the wiring harness between joint connector (CAN4) A-14 and transaxle assembly connector B-107 for a short to power supply. Measure the voltage at joint connector (CAN4) A-14. Disconnect joint connector (CAN4), and measure the voltage at the wiring harness side of joint connector (CAN4). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN4) terminal 7 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN4) terminal 20 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 9. NO: Go to Step 16 .
9. STEP 9. Check the wiring harness between joint connector (CAN3) C-127 and joint connector (CAN2) C-104 for a short to ground. Measure the resistance at joint connector (CAN3) C-127. CAUTION: Disconnect the negative battery terminal. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN3), and measure the resistance at the wiring harness side of joint connector (CAN3). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN3) terminal 11 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN3) terminal 22 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Check intermediate connector A-13, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN3) C-127 and joint connector (CAN4) A-14. NO: Check intermediate connector C-130, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between joint connector (CAN3) C-127 and joint connector (CAN2) C-104.
10. STEP 10. Using scan tool MB991958, diagnose the CAN bus line. (checking the steering wheel sensor for internal short to ground) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect ETACS-ECU connector C-301. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between steering wheel sensor connector C-209 and joint connector (CAN2) C-104. NO: Check steering wheel sensor connector C-209, and repair if necessary. If the steering wheel sensor connector is in good condition, replace the steering wheel sensor.
11. STEP 11. Using scan tool MB991958, diagnose the CAN bus line. (checking the AWC-ECU for internal short to ground) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect AWC-ECU connector C-46. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between AWC-ECU connector C-46 and joint connector (CAN2) C-104. NO: Check AWC-ECU connector C-46, and repair if necessary. If the AWC-ECU connector is in good condition, replace the AWC-ECU.
12. STEP 12. Check the wiring harness between joint connector (CAN2) C-104 and ETACS-ECU connector C-301 for short to power supply (voltage measurement). CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect ETACS-ECU connector and joint connector (CAN2), and measure at the wiring harness side. Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN2) terminal 11 and body ground. OK: 1 V or less Measure the voltage between joint connector (CAN2) terminal 22 and body ground. OK: 1 V or less Q: Do all the voltages measure 1 V or less? YES: Check ETACS-ECU connector C-301, and repair if necessary. If the ETACS-ECU connector is in good condition, replace the ETACS-ECU. NO: Repair the wiring harness between ETACS-ECU connector C-301 and joint connector (CAN2) C-104.
13. STEP 13. Using scan tool MB991958, diagnose the CAN bus line. (checking the ASC-ECU for internal short to ground) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect ASC-ECU connector A-05. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between ASC-ECU connector A-05 and joint connector (CAN3) C-127. NO: Check ASC-ECU connector A-05, and repair if necessary. If the ASC-ECU connector is in good condition, replace the ASC-ECU.
14. STEP 14. Using scan tool MB991958, diagnose the CAN bus line. (checking the ECM for internal short to ground) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect ECM connector B-10. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between ECM connector B-10 and joint connector (CAN3) C-127 , or check intermediate connector A-13, and repair if necessary. If the intermediate connector is in good condition, repair the wiring harness between ECM connector B-10 and joint connector (CAN4) A-14 . NO: Check ECM connector B-10, and repair if necessary. If the ECM connector is in good condition, replace the ECM.
15. STEP 15. Using scan tool MB991958, diagnose the CAN bus line. (checking the shift lever for internal short to ground) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect shift lever connector C-27. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between shift lever connector C-27 and joint connector (CAN3) C-127. NO: Check shift lever connector C-27, and repair if necessary. If the shift lever connector is in good condition, replace the shift lever.
16. STEP 16. Using scan tool MB991958, diagnose the CAN bus line. (checking the TC-SST-ECU for internal short to ground) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect transaxle assembly connector B-107. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between transaxle assembly connector B-107 and joint connector (CAN4) A-14. NO: Check transaxle assembly connector B-107, and repair if necessary. If the transaxle assembly connector is in good condition, replace the transaxle assembly.

DIAGNOSTIC ITEM 6: Diagnose When The Scan Tool Cannot Receive The Data Sent By AWC-ECU

Scheme 602

If a communication flag is not set for the AWC-ECU, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN2), AWC-ECU connector or intermediate connector failed improperly connected]
2. Malfunction of the wiring harness [open circuit between the AWC-ECU and the joint connector (CAN2), power supply circuit to the AWC-ECU]
3. Malfunction of the AWC-ECU

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 603

Scheme 604

1. STEP 1. Check joint connector (CAN2) C-104 and AWC-ECU connector C-46 and intermediate connector C-23 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN2) C-104 and AWC-ECU connector C-46 and intermediate connector C-23 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN2) C-104 and AWC-ECU connector C-46 for open circuit. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN2) C-104 and AWC-ECU connector C-46, and check the wiring harness. Check the wiring harness between joint connector (CAN2) C-104 (terminal 8) and AWC-ECU connector C-46 (terminal 4) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN2) C-104 (terminal 19) and AWC-ECU connector C-46 (terminal 5) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN2) C-104 and AWC-ECU connector C-46 in good condition? YES: Check the power supply circuit of the AWC-ECU. Refer to «TROUBLESHOOTING»(ref-592622-S26720082162014011000000) . NO: Repair the wiring harness between joint connector (CAN2) C-104 and AWC-ECU connector C-46.

DIAGNOSTIC ITEM 7: Diagnose When The Scan Tool Cannot Receive The Data Sent By Steering Wheel Sensor

Scheme 605

If a communication flag is not set for the steering wheel sensor, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN2) or steering wheel sensor connector improperly connected]
2. Malfunction of the wiring harness [open circuit between the steering wheel sensor and the joint connector (CAN2), power supply circuit to the steering wheel sensor]
3. Malfunction of the steering wheel sensor

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 606

Scheme 607

1. STEP 1. Check joint connector (CAN2) C-104 and steering wheel sensor connector C-209 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN2) C-104 and steering wheel sensor connector C-209 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN2) C-104 and steering wheel sensor connector C-209 for open circuit. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN2) C-104 and steering wheel sensor connector C-209, and check the wiring harness. Check the wiring harness between joint connector (CAN2) C-104 (terminal 10) and steering wheel sensor connector C-209 (terminal 3) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN2) C-104 (terminal 21) and steering wheel sensor connector C-209 (terminal 4) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN2) C-104 and steering wheel sensor connector C-209 in good condition? YES: Check the power supply circuit of the steering wheel sensor. Refer to appropriate service information under «DIAGNOSTIC TROUBLE CODE CHART»(ref-592593-S16656763792014011000000) . NO: Repair the wiring harness between joint connector (CAN2) C-104 and steering wheel sensor connector C-209.

DIAGNOSTIC ITEM 8: Diagnose When The Scan Tool Cannot Receive The Data Sent By Shift Lever

Scheme 608

If a communication flag is not set for the shift lever, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN3) or shift lever connector improperly connected]
2. Malfunction of the wiring harness [open circuit between the shift lever and the joint connector (CAN3), power supply circuit to the shift lever]
3. Malfunction of the shift lever

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 609

Scheme 610

1. STEP 1. Check joint connector (CAN3) C-127 and shift lever connector C-27 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN3) C-127 and shift lever connector C-27 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN3) C-127 and shift lever connector C-27. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN3) C-127 and shift lever connector C-27, and check the wiring harness. Check the wiring harness between joint connector (CAN3) C-127 (terminal 8) and shift lever connector C-27 (terminal 2) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN3) C-127 (terminal 19) and shift lever connector C-27 (terminal 1) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN3) C-127 and shift lever connector C-27 in good condition? YES: Check the power supply circuit of the shift lever. Refer to «TROUBLESHOOTING»(ref-592623-S36532450292014011000000) . NO: Repair the wiring harness between joint connector (CAN3) C-127 and shift lever connector C-27.

DIAGNOSTIC ITEM 9: Diagnose When The Scan Tool Cannot Receive The Data Sent By ASC-ECU

Scheme 611

If a communication flag is not set for the ASC-ECU, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN3) or ASC-ECU connector improperly connected]
2. Malfunction of the wiring harness [open circuit between the ASC-ECU and the joint connector (CAN3), power supply circuit to the ASC-ECU]
3. Malfunction of the ASC-ECU

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB991997: ASC Check Harness

Scheme 612

Scheme 613

1. STEP 1. Check joint connector (CAN3) C-127 and ASC-ECU connector A-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN3) C-127 and ASC-ECU connector A-05 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN3) C-127 and ASC-ECU connector A-05 for open circuit. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN3) C-127 and ASC-ECU connector A-05, and check the wiring harness. Check the wiring harness between joint connector (CAN3) C-127 (terminal 9) and ASC-ECU connector A-05 (terminal 12) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN3) C-127 (terminal 20) and ASC-ECU connector A-05 (terminal 13) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN3) C-127 and ASC-ECU connector A-05 in good condition? YES: Check the power supply circuit of the ASC-ECU. Refer to «INSPECTION PROCEDURE 11: ASC-ECU POWER SUPPLY CIRCUIT SYSTEM»(ref-592593-S16172611112014011000000) . NO: Repair the wiring harness between joint connector (CAN3) C-127 and ASC-ECU connector A-05.

DIAGNOSTIC ITEM 10: Diagnose When The Scan Tool Cannot Receive The Data Sent By ECM

Scheme 614

If a communication flag is not set for the ECM, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN3) , joint connector (CAN4) , ECM connector or intermediate connector improperly connected]
2. Malfunction of the wiring harness [open circuit between the ECM connector and the joint connector (CAN3) or the joint connector (CAN4) , power supply circuit to the ECM]
3. Malfunction of the ECM

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe
3. MB992110: Power plant ECU check harness

Scheme 615

Scheme 616

Scheme 617

Scheme 618

1. STEP 1. Check joint connector (CAN3) C-127 , joint connector (CAN4) A-14 , ECM connector B-10 and intermediate connector A-13 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN3) C-127 , joint connector (CAN4) A-14 , ECM connector B-10 and intermediate connector A-13 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN3) C-127 or joint connector (CAN4) A-14 and ECM connector B-10. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN3) C-127 and ECM connector B-10, and check the wiring harness. Check the wiring harness between joint connector (CAN3) C-127 (terminal 10) and ECM connector B-10 (terminal 90) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN3) C-127 (terminal 21) and ECM connector B-10 (terminal 91) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN4) A-14 (terminal 6) and ECM connector B-10 (terminal 90) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN4) A-14 (terminal 19) and ECM connector B-10 (terminal 91) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN3) C-127 or joint connector (CAN4) A-14 and ECM connector B-10 in good condition? YES: Check the power supply circuit of the ECM. Refer to «MULTIPORT FUEL INJECTION (MFI) -- LANCER EVOLUTION»(ref-592621) . NO: Repair the wiring harness between joint connector (CAN3) C-127 or joint connector (CAN4) A-14 and ECM connector B-10.

DIAGNOSTIC ITEM 11: Diagnose When The Scan Tool Cannot Receive The Data Sent By TC-SST-ECU

Scheme 619

If a communication flag is not set for the TC-SST-ECU, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN4), transaxle assembly connector improperly connected]
2. Malfunction of the wiring harness [open circuit between the transaxle assembly connector and the joint connector (CAN4), power supply circuit to the transaxle assembly]
3. Malfunction of the TC-SST-ECU

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 620

Scheme 621

1. STEP 1. Check joint connector (CAN4) A-14 and transaxle assembly connector B-107 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN4) A-14 and transaxle assembly connector B-107 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN4) A-14 and transaxle assembly connector B-107 for open circuit. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN4) A-14 and transaxle assembly B-107, and check the wiring harness. Check the wiring harness between joint connector (CAN4) A-14 (terminal 7) and transaxle assembly connector B-107 (terminal 5) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN4) A-14 (terminal 20) and transaxle assembly connector B-107 (terminal 2) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN4) A-14 and transaxle assembly connector B-107 in good condition? YES: Check the power supply circuit of the transaxle assembly. Refer to «DIAGNOSIS»(ref-592623-S16232072802014011000000) . NO: Repair the wiring harness between joint connector (CAN4) A-14 and transaxle assembly connector B-107.

DIAGNOSTIC ITEM 12: Diagnose The Lines Between The ETACS-ECU And Joint Connector (CAN2)

Scheme 622

If a communication flag is not set for some of the ECUs on the CAN-C line, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN2) or ETACS-ECU connector improperly connected]
2. Malfunction of the wiring harness [open circuit between the ETACS-ECU connector and the joint connector (CAN2), power supply circuit to the ECM]
3. Malfunction of the ETACS-ECU

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 623

Scheme 624

1. STEP 1. Check joint connector (CAN2) C-104 and ETACS-ECU connector C-301 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN2) C-104 and ETACS-ECU connector C-301 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN2) C-104 and ETACS-ECU connector C-301 for open circuit. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN2) C-104 and ETACS-ECU connector C-301, and check the wiring harness. Check the wiring harness between joint connector (CAN2) C-104 (terminal 11) and ETACS-ECU connector C-301 (terminal 9) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN2) C-104 (terminal 22) and ETACS-ECU connector C-301 (terminal 8) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN2) C-104 and ETACS-ECU connector C-301 in good condition? YES: Go to Step 3. NO: Repair the wiring harness between joint connector (CAN2) C-104 and ETACS-ECU connector C-301.
3. STEP 3. Using scan tool MB991958, diagnose the CAN bus line. CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool screen is as shown in the illustrations below. Q: Does the scan tool screen correspond to the illustration? YES: The trouble can be an intermittent malfunction (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTION»(ref-592586-S21436341472014011000000) ). NO: Replace the ETACS-ECU.

DIAGNOSTIC ITEM 13: Diagnose The Lines Between Joint Connector (CAN2) And Joint Connector (CAN3)

Scheme 625

If a communication flag is not set for some of the ECUs on the CAN-C line, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN2), joint connector (CAN3) or intermediate connector failed]
2. Malfunction of the wiring harness [open circuit between joint connector (CAN2) and joint connector (CAN3)]

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 626

Scheme 627

1. STEP 1. Check joint connector (CAN2) C-104, joint connector (CAN3) C-127 and intermediate connector C-130 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN2) C-104, joint connector (CAN3) C-127 and intermediate connector C-130 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN2) C-104 and joint connector (CAN3) C-127 for open circuit. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN2) C-104 and joint connector (CAN3) C-127, and check the wiring harness. Check the wiring harness between joint connector (CAN2) C-104 (terminal 9) and joint connector (CAN3) C-127 (terminal 11) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN2) C-104 (terminal 20) and joint connector (CAN3) C-127 (terminal 22) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN2) C-104 and joint connector (CAN3) C-127 in good condition? YES: The trouble can be an intermittent malfunction (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTION»(ref-592586-S21436341472014011000000) ). NO: Repair the wiring harness between joint connector (CAN2) C-104 and joint connector (CAN3) C-127.

DIAGNOSTIC ITEM 14: Diagnose The Lines Between Joint Connector (CAN3) And Joint Connector (CAN4)

If a communication flag is not set for some of the ECUs on the CAN-C line, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN3), joint connector (CAN4) or intermediate connector failed]
2. Malfunction of the wiring harness [open circuit between joint connector (CAN3) and joint connector (CAN4)]

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 628

Scheme 629

1. STEP 1. Check joint connector (CAN3) C-127, joint connector (CAN4) A-14 and intermediate connector A-13 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN3) C-127, joint connector (CAN4) A-14 and intermediate connector A-13 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN3) C-127 and joint connector (CAN4) A-14 for open circuit. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN3) C-127 and joint connector (CAN4) A-14, and check the wiring harness. Check the wiring harness between joint connector (CAN3) C-127 (terminal 6) and joint connector (CAN4) A-14 (terminal 5) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN3) C-127 (terminal 17) and joint connector (CAN4) A-14 (terminal 16) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN3) C-127 and joint connector (CAN4) A-14 in good condition? YES: The trouble can be an intermittent malfunction (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTION»(ref-592586-S21436341472014011000000) ). NO: Repair the wiring harness between joint connector (CAN3) C-127 and joint connector (CAN4) A-14.

DIAGNOSTIC ITEM 15: Diagnose When The Scan Tool Cannot Receive The Data Sent By KOS-ECU

Scheme 630

Scheme 631

If a communication flag is not set for the KOS-ECU, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN1), KOS-ECU connector improperly connected]
2. Malfunction of the wiring harness [open circuit between the KOS-ECU connector and the joint connector (CAN1), power supply circuit to the KOS-ECU]
3. Malfunction of the KOS-ECU

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 632

Scheme 633

1. STEP 1. Check joint connector (CAN1) C-105 and KOS-ECU connector C-05 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN1) C-105 and KOS-ECU connector C-05 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN1) C-105 and KOS-ECU connector C-05 for open circuit. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1) C-105 and KOS-ECU connector C-05, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 5) and KOS-ECU connector C-05 (terminal 1) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 16) and KOS-ECU connector C-05 (terminal 2) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN1) C-105 and KOS-ECU connector C-05 in good condition? YES: Check the power supply circuit of the KOS-ECU. Refer to «DIAGNOSIS»(ref-592599-S17094457482014011000000) . NO: Repair the wiring harness between joint connector (CAN1) C-105 and KOS-ECU connector C-05.

DIAGNOSTIC ITEM 16: Diagnose When The Scan Tool Cannot Receive The Data Sent By WCM

Scheme 634

If a communication flag is not set for the WCM, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN1), WCM connector improperly connected]
2. Malfunction of the wiring harness [open circuit between the WCM connector and the joint connector (CAN1), power supply circuit to the WCM]
3. Malfunction of the WCM

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 635

Scheme 636

1. STEP 1. Check joint connector (CAN1) C-105 and WCM connector C-07 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN1) C-105 and WCM connector C-07 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN1) C-105 and WCM connector C-07 for open circuit. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1) C-105 and WCM connector C-07, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 9) and WCM connector C-07 (terminal 11) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 20) and WCM connector C-07 (terminal 10) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN1) C-105 and WCM connector C-07 in good condition? YES: Check the power supply circuit of the WCM. Refer to «DIAGNOSIS»(ref-592600-S03604637612014011000000) . NO: Repair the wiring harness between joint connector (CAN1) C-105 and WCM connector C-07.

DIAGNOSTIC ITEM 17: Diagnose When The Scan Tool Cannot Receive The Data Sent By SRS-ECU

Scheme 637

Scheme 638

If a communication flag is not set for the SRS-ECU, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN1), SRS-ECU connector improperly connected]
2. Malfunction of the wiring harness [open circuit between the SRS-ECU connector and the joint connector (CAN1), power supply circuit to the SRS-ECU]
3. Malfunction of the SRS-ECU

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 639

Scheme 640

1. STEP 1. Check joint connector (CAN1) C-105 and SRS-ECU connector C-37 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN1) C-105 and SRS-ECU connector C-37 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37 for open circuit. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1) C-105 and SRS-ECU connector C-37, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 10) and SRS-ECU connector C-37 (terminal 15) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 21) and SRS-ECU connector C-37 (terminal 16) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37 in good condition? YES: Check the power supply circuit of the SRS-ECU. Refer to «TROUBLE SYMPTOM CHART»(ref-592595-S08841290002014011000000) . NO: Repair the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37.

DIAGNOSTIC ITEM 18: Diagnose When The Scan Tool Cannot Receive The Data Sent By Occupant Classification-ECU

Scheme 641

Scheme 642

If a communication flag is not set for the occupant classification-ECU, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN1), occupant classification-ECU connector improperly connected]
2. Malfunction of the wiring harness [open circuit between the occupant classification-ECU connector and the joint connector (CAN1), power supply circuit to the occupant classification-ECU]
3. Malfunction of the occupant classification-ECU

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 643

Scheme 644

1. STEP 1. Check joint connector (CAN1) C-105, occupant classification-ECU connector D-39, D-39-2 and intermediate connector C-41 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN1) C-105, occupant classification-ECU connector D-39, D-39-2 and intermediate connector C-23 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN1) C-105 and occupant classification-ECU connector D-39-2 for open circuit. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1) C-105 and occupant classification-ECU connector D-39-2, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 3) and occupant classification-ECU connector D-39-2 (terminal 24) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 14) and occupant classification-ECU connector D-39-2 (terminal 25) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN1) C-105 and occupant classification-ECU connector D-39-2 in good condition? YES: Check the power supply circuit of the occupant classification-ECU. Refer to «TROUBLE SYMPTOM CHART»(ref-592595-S08841290002014011000000) . NO: Repair the wiring harness between joint connector (CAN1) C-105 and occupant classification-ECU connector D-39-2.

DIAGNOSTIC ITEM 19: Diagnose When The Scan Tool Cannot Receive The Data Sent By A/C-ECU Or Heater Control Unit

Scheme 645

If a communication flag is not set for the A/C-ECU or heater control unit , the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN1), A/C-ECU or heater control unit connector improperly connected]
2. Malfunction of the wiring harness [open circuit between the A/C-ECU or heater control unit connector and the joint connector (CAN1), power supply circuit to the A/C-ECU or heater control unit ]
3. Malfunction of the A/C-ECU or heater control unit

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 646

Scheme 647

1. STEP 1. Check joint connector (CAN1) C-105 and A/C-ECU connector C-22 or heater control unit connector C-53 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN1) C-105 and A/C-ECU connector C-22 or heater control unit connector C-53 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN1) C-105 and A/C-ECU connector C-22 or heater control unit connector C-53 for open circuit. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1) C-105 and A/C control panel connector C-123 or heater control panel connector C-138, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 6) and A/C control panel connector C-123 or heater control panel connector C-138 (terminal 7) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 17) and A/C control panel connector C-123 or heater control panel connector C-138 (terminal 8) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN1) C-105 and A/C control panel connector C-123 or heater control panel connector C-138 in good condition? YES: Check the power supply circuit of the A/C control panel or heater control panel. Refer to «DIAGNOSIS»(ref-592583-S15254945482014011000000) or «DIAGNOSIS»(ref-592583-S36178451942014011000000) . NO: Repair the wiring harness between joint connector (CAN1) C-105 and A/C control panel connector C-123 or heater control panel connector C-138.

DIAGNOSTIC ITEM 20: Diagnose When The Scan Tool Cannot Receive The Data Sent By Radio And CD Player Or CD Changer

Scheme 648

If a communication flag is not set for the radio and CD player or CD changer, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN1), radio and CD player or CD changer connector improperly connected]
2. Malfunction of the wiring harness [open circuit between the radio and CD player or CD changer connector and the joint connector (CAN1), power supply circuit to the radio and CD player or CD changer]
3. Malfunction of the radio and CD player or CD changer

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 649

Scheme 650

1. STEP 1. Check joint connector (CAN1) C-105 and radio and CD player or CD changer connector C-107 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN1) C-105 and radio and CD player or CD changer connector C-107 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN1) C-105 and radio and CD player or CD changer connector C-107 for open circuit. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1) C-105 and radio and CD player or CD changer connector C-107, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 8) and radio and CD player or CD changer connector C-107 (terminal 23) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 19) and radio and CD player or CD changer connector C-107 (terminal 33) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN1) C-105 and radio and CD player or CD changer connector C-107 in good condition? YES: Check the power supply circuit of the radio and CD player or CD changer. Refer to «TROUBLE SYMPTOM CHART»(ref-592601-S34363225362014011000000) . NO: Repair the wiring harness between joint connector (CAN1) C-105 and radio and CD player or CD changer connector C-107.

DIAGNOSTIC ITEM 21: Diagnose When The Scan Tool Cannot Receive The Data Sent By CAN Box Unit

Scheme 651

If a communication flag is not set for the CAN box unit, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN1), CAN box unit connector improperly connected]
2. Malfunction of the wiring harness [open circuit between the CAN box unit connector and the joint connector (CAN1), power supply circuit to the CAN box unit]
3. Malfunction of the CAN box unit

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 652

Scheme 653

1. STEP 1. Check joint connector (CAN1) C-105, CAN box unit connector C-15 and intermediate connector C-108 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN1) C-105, CAN box unit connector C-15 and intermediate connector C-108 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN1) C-105 and CAN box unit connector C-15 for open circuit. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1) C-105 and CAN box unit connector C-15, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 8) and CAN box unit connector C-15 (terminal 8) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 19) and CAN box unit connector C-15 (terminal 9) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN1) C-105 and CAN box unit connector C-15 in good condition? YES: Check the power supply circuit of the CAN box unit. Refer to «TROUBLE SYMPTOM CHART»(ref-592603-S42769495692014011000000) . NO: Repair the wiring harness between joint connector (CAN1) C-105 and CAN box unit connector C-15.

DIAGNOSTIC ITEM 22: Diagnose When The Scan Tool Cannot Receive The Data Sent By Satellite Radio Tuner

Scheme 654

If a communication flag is not set for the satellite radio tuner, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN1), satellite radio tuner connector improperly connected]
2. Malfunction of the wiring harness [open circuit between the satellite radio tuner connector and the joint connector (CAN1), power supply circuit to the satellite radio tuner]
3. Malfunction of the satellite radio tuner

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 655

Scheme 656

1. STEP 1. Check joint connector (CAN1) C-105 and satellite radio tuner connector C-18 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN1) C-105 and satellite radio tuner connector C-18 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN1) C-105 and satellite radio tuner connector C-18 for open circuit. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1) C-105 and satellite radio tuner connector C-18, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 4) and satellite radio tuner connector C-18 (terminal 4) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 15) and satellite radio tuner connector C-18 (terminal 11) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN1) C-105 and satellite radio tuner connector C-18 in good condition? YES: Check the power supply circuit of the satellite radio tuner. Refer to «TROUBLE SYMPTOM CHART»(ref-592602-S27885797732014011000000) . NO: Repair the wiring harness between joint connector (CAN1) C-105 and satellite radio tuner connector C-18.

DIAGNOSTIC ITEM 23: Diagnose When The Scan Tool Cannot Receive The Data Sent By Combination Meter

Scheme 657

If a communication flag is not set for the combination meter, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN1), combination meter connector improperly connected]
2. Malfunction of the wiring harness [open circuit between the combination meter connector and the joint connector (CAN1), power supply circuit to the combination meter]
3. Malfunction of the combination meter

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 658

Scheme 659

1. STEP 1. Check joint connector (CAN1) C-105 and combination meter connector C-04 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN1) C-105 and combination meter connector C-04 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN1) C-105 and combination meter connector C-04. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1) C-105 and combination meter connector C-04, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 7) and combination meter connector C-04 (terminal 14) Check the wiring harness between joint connector (CAN1) C-105 (terminal 18) and combination meter connector C-04 (terminal 15) Q: Is the wiring harness between joint connector (CAN1) C-105 and combination meter connector C-04 in good condition? YES: Check the power supply circuit of the combination meter. Refer to «TROUBLE SYMPTOM CHART»(ref-592598-S20417199072014011000000) . NO: Repair the wiring harness between joint connector (CAN1) C-105 and combination meter connector C-04.

DIAGNOSTIC ITEM 24: Short To Power Supply Or Ground In Both CAN_H And CAN_L Lines Of The CAN-B Bus Lines

Scheme 660

If a communication flag is set for the ETACS-ECU, no communication is present through the CAN-B line, and diagnostic trouble code U0019 is set, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector (ETACS-ECU connector improperly connected)
2. Malfunction of the wiring harness (CAN_H and CAN_L lines are short to power supply or ground on the CAN-B line.)
3. Malfunction of ECUs

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 661

Scheme 662

Scheme 663

Scheme 664

Scheme 665

Scheme 666

Scheme 667

Scheme 668

Scheme 669

Scheme 670

Scheme 671

Scheme 672

Scheme 673

Scheme 674

Scheme 675

Scheme 676

Scheme 677

Scheme 678

Scheme 679

Scheme 680

Scheme 681

Scheme 682

Scheme 683

Scheme 684

Scheme 685

Scheme 686

Scheme 687

Scheme 688

Scheme 689

Scheme 690

Scheme 691

Scheme 692

Scheme 693

Scheme 694

Scheme 695

Scheme 696

Scheme 697

Scheme 698

Scheme 699

Scheme 700

Scheme 701

Scheme 702

1. STEP 1. Check the wiring harness between ETACS-ECU connector C-301 and body ground for a short to power supply. Measure the voltage at ETACS-ECU connector C-301. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect ETACS-ECU connector C-301, and measure the voltage at the wiring harness side of ETACS-ECU connector. Turn the ignition switch to the ON position. Measure the voltage between ETACS-ECU connector terminal 6 and body ground. OK: 4.7 V or less Measure the voltage between ETACS-ECU connector terminal 7 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 2. NO: Go to Step 12 .
2. STEP 2. Check the wiring harness between joint connector (CAN1) C-105 and combination meter connector C-04 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 7 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 18 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES : Go to Step 3. YES : Go to Step 4 . NO (vehicles with KOS or WCM): Go to Step 22 .
3. STEP 3. Check the wiring harness between joint connector (CAN1) C-105 and KOS-ECU connector C-05 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 5 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 16 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 5 . NO: Go to Step 23 .
4. STEP 4. Check the wiring harness between joint connector (CAN1) C-105 and WCM connector C-07 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 9 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 20 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 5. NO: Go to Step 24 .
5. STEP 5. Check the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 10 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 21 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 6. NO: Go to Step 25 .
6. STEP 6. Check the wiring harness between joint connector (CAN1) C-105 and occupant classification-ECU connector D-39-2 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 3 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 14 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 7. NO: Go to Step 26 .
7. STEP 7. Check the wiring harness between joint connector (CAN1) C-105 and A/C-ECU connector C-22 or heater control unit connector C-53 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 6 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 17 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES (vehicles without MMCS): Go to Step 8. YES (vehicles with MMCS): Go to Step 9 . NO: Go to Step 27 .
8. STEP 8. Check the wiring harness between joint connector (CAN1) C-105 and radio and CD player or CD changer connector C-107 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 8 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 19 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES : Go to Step 11 . YES : Go to Step 10 . NO: Go to Step 28 .
9. STEP 9. Check the wiring harness between joint connector (CAN1) C-105 and CAN box unit connector C-15 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 8 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 19 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES (vehicles without satellite radio): Go to Step 11 . YES (vehicles with satellite radio): Go to Step 10. NO: Go to Step 29 .
10. STEP 10. Check the wiring harness between joint connector (CAN1) C-105 and satellite radio tuner connector C-18 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 4 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 15 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 11. NO: Go to Step 30 .
11. STEP 11. Check the wiring harness between joint connector (CAN1) C-105 and ETACS-ECU connector C-301 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1) and ETACS-ECU connector C-301, and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 11 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 22 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 31 . NO: Repair the wiring harness between joint connector (CAN1) C-105 and ETACS-ECU connector C-301.
12. STEP 12. Check the wiring harness between joint connector (CAN1) C-105 and combination meter connector C-04 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 7 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 18 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES (vehicles with KOS): Go to Step 13. YES (vehicles with WCM): Go to Step 14 . NO (vehicles with KOS and WCM): Go to Step 22 .
13. STEP 13. Check the wiring harness between joint connector (CAN1) C-105 and KOS-ECU connector C-05 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 5 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 16 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 15 . NO: Go to Step 23 .
14. STEP 14. Check the wiring harness between joint connector (CAN1) C-105 and WCM connector C-07 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 9 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 20 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 15. NO: Go to Step 24 .
15. STEP 15. Check the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 10 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 21 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 16. NO: Go to Step 25 .
16. STEP 16. Check the wiring harness between joint connector (CAN1) C-105 and occupant classification-ECU connector D-39-2 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 3 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 14 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 17. NO: Go to Step 26 .
17. STEP 17. Check the wiring harness between joint connector (CAN1) C-105 and A/C control panel connector C-123 or heater control panel connector C-138 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 6 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 17 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES (vehicles without MMCS): Go to Step 18. YES (vehicles with MMCS): Go to Step 19 . NO: Go to Step 27 .
18. STEP 18. Check the wiring harness between joint connector (CAN1) C-105 and radio and CD player or CD changer connector C-107 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 8 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 19 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES (vehicles without satellite radio): Go to Step 21 . YES (vehicles with satellite radio): Go to Step 20 . NO: Go to Step 28.
19. STEP 19. Check the wiring harness between joint connector (CAN1) C-105 and CAN box unit connector C-15 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 8 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 19 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES (vehicles without satellite radio): Go to Step 21 . YES (vehicles with satellite radio): Go to Step 20. NO: Go to Step 29 .
20. STEP 20. Check the wiring harness between joint connector (CAN1) C-105 and satellite radio tuner connector C-18 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 4 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 15 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 21. NO: Go to Step 30 .
21. STEP 21. Check the wiring harness between joint connector (CAN1) C-105 and ETACS-ECU connector C-301 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1) and ETACS-ECU connector C-301, and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 11 and body ground. OK: 1 V or less Measure the voltage between joint connector (CAN1) terminal 22 and body ground. OK: 1 V or less Q: Do all the voltages measure 1 V or less? YES: Go to Step 31 . NO: Repair the wiring harness between joint connector (CAN1) C-105 and ETACS-ECU connector C-301.
22. STEP 22. Using scan tool MB991958, diagnose the CAN bus line. (checking the combination meter for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect combination meter connector C-04. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and combination meter connector C-04. NO: Check combination meter connector C-04, and repair if necessary. If the combination meter connector is in good condition, replace the combination meter.
23. STEP 23. Using scan tool MB991958, diagnose the CAN bus line. (checking the KOS-ECU for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect KOS-ECU connector C-05. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and KOS-ECU connector C-05. NO: Check KOS-ECU connector C-05, and repair if necessary. If the KOS-ECU connector is in good condition, replace the KOS-ECU.
24. STEP 24. Using scan tool MB991958, diagnose the CAN bus line. (checking the WCM for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect WCM connector C-07. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and WCM connector C-07. NO: Check WCM connector C-07, and repair if necessary. If the WCM connector is in good condition, replace the WCM.
25. STEP 25. Using scan tool MB991958, diagnose the CAN bus line. (checking the SRS-ECU for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect SRS-ECU connector C-37. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37. NO: Check SRS-ECU connector C-37, and repair if necessary. If the SRS-ECU connector is in good condition, replace the SRS-ECU.
26. STEP 26. Using scan tool MB991958, diagnose the CAN bus line. (checking the occupant classification-ECU for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect occupant classification-ECU connector D-39-2. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and occupant classification-ECU connector D-39-2. NO: Check occupant classification-ECU connector D-39-2, and repair if necessary. If the occupant classification-ECU connector is in good condition, replace the occupant classification-ECU.
27. STEP 27. Using scan tool MB991958, diagnose the CAN bus line. (checking the A/C control panel or heater control panel for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect A/C control panel connector C-123 or heater control panel connector C-138 . Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and A/C control panel connector C-123 or heater control panel connector C-138 . NO: Check A/C control panel connector C-123 or heater control panel connector C-138 , and repair if necessary. If the A/C control panel connector or heater control panel connector is in good condition, replace the A/C control panel or heater control panel .
28. STEP 28. Using scan tool MB991958, diagnose the CAN bus line. (checking the radio and CD player or CD changer for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect radio and CD player or CD changer connector C-107. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and radio and CD player or CD changer connector C-107. NO: Check radio and CD player or CD changer connector C-107, and repair if necessary. If the radio and CD player or CD changer connector is in good condition, replace the radio and CD player or CD changer.
29. STEP 29. Using scan tool MB991958, diagnose the CAN bus line. (checking the CAN box unit for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect CAN box unit connector C-15. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and CAN box unit connector C-15. NO: Check CAN box unit connector C-15, and repair if necessary. If the CAN box unit connector is in good condition, replace the CAN box unit.
30. STEP 30. Using scan tool MB991958, diagnose the CAN bus line. (checking the satellite radio tuner for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect satellite radio tuner connector C-18. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and satellite radio tuner connector C-18. NO: Check satellite radio tuner connector C-18, and repair if necessary. If the satellite radio tuner connector is in good condition, replace the satellite radio tuner.
31. STEP 31. Using scan tool MB991958, diagnose the CAN bus line. (trouble symptom check) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: The trouble can be an intermittent malfunction (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTION»(ref-592586-S21436341472014011000000) ). NO: Check the ETACS-ECU connector C-301, and repair if necessary. If the ETACS-ECU connector is in good condition, replace the ETACS-ECU.

DIAGNOSTIC ITEM 25: Diagnose The ETACS-ECU, Joint Connector (CAN1) Or Lines Between ETACS-ECU And Joint Connector (CAN1)

Scheme 703

If a communication flag is set for none of the ECUs on the CAN-B line, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector [joint connector (CAN1) or ETACS-ECU connector improperly connected]
2. Malfunction of the wiring harness [open circuit between the ETACS-ECU connector and the joint connector (CAN1)]
3. Malfunction of the ETACS-ECU

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 704

Scheme 705

1. STEP 1. Check joint connector (CAN1) C-105 and EATCS-ECU connector C-301 for loose, corroded or damaged terminals, or terminals pushed back in the connector. CAUTION: The strand end of the twisted wire should be within 10 cm (4 inches) from the connector. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Q: Are joint connector (CAN1) C-105 and ETACS-ECU connector C-301 in good condition? YES: Go to Step 2. NO: Repair the damaged parts.
2. STEP 2. Check the wiring harness between joint connector (CAN1) C-105 and ETACS-ECU connector C-301. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1) C-105 and ETACS-ECU connector C-301, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 11) and ETACS-ECU connector C-301 (terminal 6) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 22) and ETACS-ECU connector C-301 (terminal 7) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN1) C-105 and ETACS-ECU connector C-301 in good condition? YES: Go to Step 3. NO: Repair the wiring harness between joint connector (CAN1) C-105 and ETACS-ECU connector C-301.
3. STEP 3. Using scan tool MB991958, diagnose the CAN bus line. (trouble symptom check) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: The trouble can be an intermittent malfunction (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTION»(ref-592586-S21436341472014011000000) ). NO: Replace the ETACS-ECU.

DIAGNOSTIC ITEM 26: Short To Power Supply Or Ground, Open Circuit Or Line-To-Line Short In The CAN-B Bus Lines

Scheme 706

When CAN-B lines communication is normal, and diagnostic trouble code U0019 is set, the ETACS-ECU determines that there is a failure.

1. Malfunction of the connector (short to power supply or ground in connector or improperly connected)
2. Malfunction of the wiring harness (short to power supply or ground, open circuit or line-to-line short in CAN bus lines)
3. Faulty ECU(s) (internal short to power supply or ground)

Required Special Tools

1. MB991223: Harness Set
2. MB992006: Extra Fine Probe

Scheme 707

Scheme 708

Scheme 709

Scheme 710

Scheme 711

Scheme 712

Scheme 713

Scheme 714

Scheme 715

Scheme 716

Scheme 717

Scheme 718

Scheme 719

Scheme 720

Scheme 721

Scheme 722

Scheme 723

Scheme 724

Scheme 725

Scheme 726

Scheme 727

Scheme 728

Scheme 729

Scheme 730

1. STEP 1. Check the wiring harness between ETACS-ECU connector C-301 and body ground for a short to ground. Measure the resistance at ETACS-ECU connector C-301. CAUTION: Disconnect the negative battery terminal. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: A digital multimeter should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: The test wiring harness should be used. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect ETACS-ECU connector C-301, and measure the voltage at the wiring harness side of ETACS-ECU connector. Measure the resistance between ETACS-ECU connector terminal 6 and body ground. OK: 1 kohms or more Measure the resistance between ETACS-ECU connector terminal 7 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 2. NO: Go to Step 12 .
2. STEP 2. Check the wiring harness between joint connector (CAN1) C-105 and combination meter connector C-04 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 7 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 18 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES (vehicles with KOS): Go to Step 3. YES (vehicles with WCM): Go to Step 4 . NO (vehicles with KOS or WCM): Go to Step 44 .
3. STEP 3. Check the wiring harness between joint connector (CAN1) C-105 and KOS-ECU connector C-05 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 5 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 16 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 5 . NO: Go to Step 45 .
4. STEP 4. Check the wiring harness between joint connector (CAN1) C-105 and WCM connector C-07 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 9 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 20 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 5. NO: Go to Step 46 .
5. STEP 5. Check the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 10 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 21 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 6. NO: Go to Step 47 .
6. STEP 6. Check the wiring harness between joint connector (CAN1) C-105 and occupant classification-ECU connector D-39-2 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 3 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 14 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 7. NO: Go to Step 48 .
7. STEP 7 Check the wiring harness between joint connector (CAN1) C-105 and A/C control panel connector C-123 or heater control panel connector C-138 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 6 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 17 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES (vehicles without MMCS): Go to Step 8. YES (vehicles with MMCS): Go to Step 9 . NO: Go to Step 49 .
8. STEP 8 Check the wiring harness between joint connector (CAN1) C-105 and radio and CD player or CD changer connector C-107 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 8 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 19 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES (vehicles without satellite radio): Go to Step 11 . YES (vehicles with satellite radio): Go to Step 12 . NO: Go to Step 50 .
9. STEP 9. Check the wiring harness between joint connector (CAN1) C-105 and CAN box unit connector C-15 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 8 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 19 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES (vehicles without satellite radio): Go to Step 11 . YES (vehicles with satellite radio): Go to Step 10. NO: Go to Step 51 .
10. STEP 10 Check the wiring harness between joint connector (CAN1) C-105 and satellite radio tuner connector C-18 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 4 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 15 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 11. NO: Go to Step 52 .
11. STEP 11. Check the wiring harness between joint connector (CAN1) C-105 and ETACS-ECU connector C-301 for a short to ground. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1) and ETACS-ECU connector C-301, and measure the resistance at the wiring harness side of joint connector (CAN1). Measure the resistance between joint connector (CAN1) terminal 11 and body ground. OK: 1 kohms or more Measure the resistance between joint connector (CAN1) terminal 22 and body ground. OK: 1 kohms or more Q: Do all the resistances measure 1 kohms or more? YES: Go to Step 53 . NO: Repair the wiring harness between joint connector (CAN1) C-105 and ETACS-ECU connector C-301.
12. STEP 12. Check the wiring harness between ETACS-ECU connector C-301 and body ground for a short to power supply. Measure the voltage at ETACS-ECU connector C-301. Disconnect ETACS-ECU connector C-301, and measure the voltage at the wiring harness side of ETACS-ECU connector. Turn the ignition switch to the ON position. Measure the voltage between ETACS-ECU connector terminal 6 and body ground. OK: 4.7 V or less Measure the voltage between ETACS-ECU connector terminal 7 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 23 . NO: Go to Step 13.
13. STEP 13. Check the wiring harness between joint connector (CAN1) C-105 and combination meter connector C-04 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Connect the negative battery terminal. Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 7 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 18 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES (vehicles with KOS): Go to Step 14. YES (vehicles with WCM): Go to Step 15 . NO (vehicles with KOS and WCM): Go to Step 44 .
14. STEP 14. Check the wiring harness between joint connector (CAN1) C-105 and KOS-ECU connector C-05 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 5 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 16 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 16 . NO: Go to Step 45 .
15. STEP 15. Check the wiring harness between joint connector (CAN1) C-105 and WCM connector C-07 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 9 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 20 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 16. NO: Go to Step 46 .
16. STEP 16. Check the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 10 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 21 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 17. NO: Go to Step 47 .
17. STEP 17. Check the wiring harness between joint connector (CAN1) C-105 and occupant classification-ECU connector D-39-2 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 3 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 14 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 18. NO: Go to Step 48 .
18. STEP 18. Check the wiring harness between joint connector (CAN1) C-105 and A/C control panel connector C-123 or heater control panel connector C-138 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 6 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 17 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES (vehicles without MMCS): Go to Step 19. YES (vehicles with MMCS): Go to Step 20 . NO: Go to Step 49 .
19. STEP 19. Check the wiring harness between joint connector (CAN1) C-105 and radio and CD player or CD changer connector C-107 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 8 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 19 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES (vehicles without satellite radio): Go to Step 22 . YES (vehicles with satellite radio): Go to Step 21 . NO: Go to Step 50 .
20. STEP 20. Check the wiring harness between joint connector (CAN1) C-105 and CAN box unit connector C-15 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 8 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 19 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES (vehicles without satellite radio): Go to Step 22 . YES (vehicles with satellite radio): Go to Step 21. NO: Go to Step 51 .
21. STEP 21. Check the wiring harness between joint connector (CAN1) C-105 and satellite radio tuner connector C-18 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 4 and body ground. OK: 4.7 V or less Measure the voltage between joint connector (CAN1) terminal 15 and body ground. OK: 4.7 V or less Q: Do all the voltages measure 4.7 V or less? YES: Go to Step 22. NO: Go to Step 52 .
22. STEP 22. Check the wiring harness between joint connector (CAN1) C-105 and ETACS-ECU connector C-301 for a short to power supply. Measure the voltage at joint connector (CAN1) C-105. Disconnect joint connector (CAN1) and ETACS-ECU connector C-301, and measure the voltage at the wiring harness side of joint connector (CAN1). Turn the ignition switch to the ON position. Measure the voltage between joint connector (CAN1) terminal 11 and body ground. OK: 1 V or less Measure the voltage between joint connector (CAN1) terminal 22 and body ground. OK: 1 V or less Q: Do all the voltages measure 1 V or less? YES: Go to Step 53 . NO: Repair the wiring harness between joint connector (CAN1) C-105 and ETACS-ECU connector C-301.
23. STEP 23. Check the wiring harness for line-to-line short. Measure the resistance at ETACS-ECU connector C-301 CAUTION: Disconnect the negative battery terminal. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect ETACS-ECU connector C-301, and check that there is continuity at the harness side of ETACS-ECU. Check that there is continuity between ETACS-ECU connector terminals 6 and 7. OK: No continuity Q: Is the check result normal? YES: Go to Step 34 . NO: Go to Step 24.
24. STEP 24. Check the wiring harness between joint connector (CAN1) C-105 and combination meter connector C-04 for line-to-line short. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1). Check that there is continuity between joint connector (CAN1) terminals 7 and 18. OK: No continuity Q: Is the check result normal? YES (vehicles with KOS): Go to Step 25. YES (vehicles with WCM): Go to Step 26 . NO (vehicles with KOS or WCM): Go to Step 44 .
25. STEP 25. Check the wiring harness between joint connector (CAN1) C-105 and KOS-ECU connector C-05 for line-to-line short. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1). Check that there is continuity between joint connector (CAN1) terminals 5 and 16. OK: No continuity Q: Is the check result normal? YES: Go to Step 27 . NO: Go to Step 45 .
26. STEP 26. Check the wiring harness between joint connector (CAN1) C-105 and WCM connector C-07 for line-to-line short. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1). Check that there is continuity between joint connector (CAN1) terminals 9 and 20. OK: No continuity Q: Is the check result normal? YES: Go to Step 27. NO: Go to Step 46 .
27. STEP 27. Check the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37 for line-to-line short. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1). Check that there is continuity between joint connector (CAN1) terminals 10 and 21. OK: No continuity Q: Is the check result normal? YES: Go to Step 28. NO: Go to Step 47 .
28. STEP 28. Check the wiring harness between joint connector (CAN1) C-105 and occupant classification-ECU connector D-39-2 for line-to-line short. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1). Check that there is continuity between joint connector (CAN1) terminals 3 and 14. OK: No continuity Q: Is the check result normal? YES: Go to Step 29. NO: Go to Step 48 .
29. STEP 29. Check the wiring harness between joint connector (CAN1) C-105 and A/C control panel connector C-123 or heater control panel connector C-138 for line-to-line short. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1). Check that there is continuity between joint connector (CAN1) terminals 6 and 17. OK: No continuity Q: Is the check result normal? YES (vehicles without MMCS): Go to Step 30. YES (vehicles with MMCS): Go to Step 31 . NO: Go to Step 49 .
30. STEP 30. Check the wiring harness between joint connector (CAN1) C-105 and radio and CD player or CD changer connector C-107 for line-to-line short. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1). Check that there is continuity between joint connector (CAN1) terminals 8 and 19. OK: No continuity Q: Is the check result normal? YES (vehicles without satellite radio): Go to Step 33 . YES (vehicles with satellite radio): Go to Step 32 . NO: Go to Step 50 .
31. STEP 31. Check the wiring harness between joint connector (CAN1) C-105 and CAN box unit connector C-15 for line-to-line short. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1). Check that there is continuity between joint connector (CAN1) terminals 8 and 19. OK: No continuity Q: Is the check result normal? YES (vehicles without satellite radio): Go to Step 33 . YES (vehicles with satellite radio): Go to Step 32. NO: Go to Step 51 .
32. STEP 32. Check the wiring harness between joint connector (CAN1) C-105 and satellite radio tuner connector C-18 for line-to-line short. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1), and check that there is continuity at the harness side of joint connector (CAN1). Check that there is continuity between joint connector (CAN1) terminals 4 and 15. OK: No continuity Q: Is the check result normal? YES: Go to Step 33. NO: Go to Step 52 .
33. STEP 33. Check the wiring harness between joint connector (CAN1) C-105 and EATCS-ECU connector C-301 for line-to-line short. Measure the resistance at joint connector (CAN1) C-105. Disconnect joint connector (CAN1) and ETACS-ECU connector C-301, and check that there is continuity at the harness side of joint connector (CAN1). Check that there is continuity between joint connector (CAN1) terminals 11 and 22. OK: No continuity Q: Is the check result normal? YES: Go to Step 53 . NO: Repair the wiring harness between joint connector (CAN1) C-105 and ETACS-ECU connector C-301.
34. STEP 34. Check the wiring harness between joint connector (CAN1) C-105 and combination meter connector C-04 for open circuit. CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . Disconnect joint connector (CAN1) C-105 and combination meter connector C-301, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 7) and combination meter connector C-04 (terminal 14) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 18) and combination meter connector C-04 (terminal 15) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN1) C-105 and combination meter connector C-04 in good condition? YES (vehicles with KOS): Go to Step 35. YES (vehicles with WCM): Go to Step 36 . NO (vehicles with KOS or WCM): Go to Step 44 .
35. STEP 35. Check the wiring harness between joint connector (CAN1) C-105 and KOS-ECU connector C-05 for open circuit. Disconnect joint connector (CAN1) C-105 and KOS-ECU connector C-05, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 5) and KOS-ECU connector C-05 (terminal 1) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 16) and KOS-ECU connector C-05 (terminal 2) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN1) C-105 and KOS-ECU connector C-05 in good condition? YES: Go to Step 37 . NO: Go to Step 45 .
36. STEP 36. Check the wiring harness between joint connector (CAN1) C-105 and WCM connector C-07 for open circuit. Disconnect joint connector (CAN1) C-105 and WCM connector C-07, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 9) and WCM connector C-07 (terminal 11) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 20) and WCM connector C-07 (terminal 10) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN1) C-105 and WCM connector C-07 in good condition? YES: Go to Step 37. NO: Go to Step 46 .
37. STEP 37. Check the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37 for open circuit. Disconnect joint connector (CAN1) C-105 and SRS-ECU connector C-37, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 10) and SRS-ECU connector C-37 (terminal 15) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 21) and SRS-ECU connector C-37 (terminal 16) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37 in good condition? YES: Go to Step 38. NO: Go to Step 47 .
38. STEP 38. Check the wiring harness between joint connector (CAN1) C-105 and occupant classification-ECU connector D-39-2 for open circuit. Disconnect joint connector (CAN1) C-105 and occupant classification-ECU connector D-39-2, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 3) and occupant classification-ECU connector D-39-2 (terminal 24) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 14) and occupant classification-ECU connector D-39-2 (terminal 25) OK: Continuity exists (2 ohms or less) NOTE: Prior to the wiring harness inspection, check intermediate connector C-23 and front seat assembly (LH) connector D-39, and repair if necessary. Q: Is the wiring harness between joint connector (CAN1) C-105 and occupant classification-ECU connector D-39-2 in good condition? YES: Go to Step 39. NO: Go to Step 48 .
39. STEP 39. Check the wiring harness between joint connector (CAN1) C-105 and A/C control panel connector C-123 or heater control panel connector C-138 for open circuit. Disconnect joint connector (CAN1) C-105 and A/C control panel connector C-123 or heater control panel connector C-138 , and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 6) and A/C control panel connector C-123 or heater control panel connector C-138 (terminal 7) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 17) and A/C control panel connector C-123 or heater control panel connector C-138 (terminal 8) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN1) C-105 and A/C control panel connector C-123 or heater control panel connector C-138 in good condition? YES (vehicles without MMCS): Go to Step 40. YES (vehicles with MMCS): Go to Step 41 . NO: Go to Step 49 .
40. STEP 40. Check the wiring harness between joint connector (CAN1) C-105 and radio and CD player or CD changer connector C-107 for open circuit. Disconnect joint connector (CAN1) C-105 and radio and CD player or CD changer connector C-107, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 8) and radio and CD player or CD changer connector C-107 (terminal 23) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 19) and radio and CD player or CD changer connector C-107 (terminal 33) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN1) C-105 and radio and CD player or CD changer connector C-107 in good condition? YES (vehicles without satellite radio): Go to Step 43 . YES (vehicles with satellite radio): Go to Step 42 . NO: Go to Step 50 .
41. STEP 41. Check the wiring harness between joint connector (CAN1) C-105 and CAN box unit connector C-15 for open circuit. Disconnect joint connector (CAN1) C-105 and CAN box unit connector C-15, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 8) and CAN box unit connector C-15 (terminal 8) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 19) and CAN box unit connector C-15 (terminal 9) OK: Continuity exists (2 ohms or less) NOTE: Prior to the wiring harness inspection, check intermediate connector C-108, and repair if necessary. Q: Is the wiring harness between joint connector (CAN1) C-105 and CAN box unit connector C-15 in good condition? YES (vehicles without satellite radio): Go to Step 43 . YES (vehicles with satellite radio): Go to Step 42. NO: Go to Step 51 .
42. STEP 42. Check the wiring harness between joint connector (CAN1) C-105 and satellite radio tuner connector C-18 for open circuit. Disconnect joint connector (CAN1) C-105 and satellite radio tuner connector C-18, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 4) and satellite radio tuner connector C-18 (terminal 4) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 15) and satellite radio tuner connector C-18 (terminal 11) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN1) C-105 and satellite radio tuner connector C-18 in good condition? YES: Go to Step 43. NO: Go to Step 52 .
43. STEP 43. Check the wiring harness between joint connector (CAN1) C-105 and ETACS-ECU connector C-301 for open circuit. Disconnect joint connector (CAN1) C-105 and ETACS-ECU connector C-301, and check the wiring harness. Check the wiring harness between joint connector (CAN1) C-105 (terminal 11) and ETACS-ECU connector C-301 (terminal 6) OK: Continuity exists (2 ohms or less) Check the wiring harness between joint connector (CAN1) C-105 (terminal 22) and ETACS-ECU connector C-301 (terminal 7) OK: Continuity exists (2 ohms or less) Q: Is the wiring harness between joint connector (CAN1) C-105 and ETACS-ECU connector C-301 in good condition? YES: Go to Step 53 . NO: Repair the wiring harness between joint connector (CAN1) C-105 and ETACS-ECU connector C-301.
44. STEP 44. Using scan tool MB991958, diagnose the CAN bus line. (checking the combination meter for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect combination meter connector C-04. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and combination meter connector C-04. NO: Check combination meter connector C-04, and repair if necessary. If the combination meter connector is in good condition, replace the combination meter.
45. STEP 45. Using scan tool MB991958, diagnose the CAN bus line. (checking the KOS-ECU for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect KOS-ECU connector C-05. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and KOS-ECU connector C-05. NO: Check KOS-ECU connector C-05, and repair if necessary. If the KOS-ECU connector is in good condition, replace the KOS-ECU.
46. STEP 46. Using scan tool MB991958, diagnose the CAN bus line. (checking the WCM for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect WCM connector C-07. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and WCM connector C-07. NO: Check WCM connector C-07, and repair if necessary. If the WCM connector is in good condition, replace the WCM.
47. STEP 47. Using scan tool MB991958, diagnose the CAN bus line. (checking the SRS-ECU for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect SRS-ECU connector C-37. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and SRS-ECU connector C-37. NO: Check SRS-ECU connector C-37, and repair if necessary. If the SRS-ECU connector is in good condition, replace the SRS-ECU.
48. STEP 48. Using scan tool MB991958, diagnose the CAN bus line. (checking the occupant classification-ECU for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect occupant classification-ECU connector D-39-2. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and occupant classification-ECU connector D-39-2. NO: Check occupant classification-ECU connector D-39-2, and repair if necessary. If the occupant classification-ECU connector is in good condition, replace the occupant classification-ECU.
49. STEP 49. Using scan tool MB991958, diagnose the CAN bus line. (checking the A/C control panel or heater control panel for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect A/C control panel connector C-123 or heater control panel connector C-138 . Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and A/C control panel connector C-123 or heater control panel connector C-138 . NO: Check A/C control panel connector C-123 or heater control panel connector C-138 , and repair if necessary. If the A/C control panel connector C-123 or heater control panel connector C-138 is in good condition, replace the A/C control panel or heater control panel .
50. STEP 50. Using scan tool MB991958, diagnose the CAN bus line. (checking the radio and CD player or CD changer for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect radio and CD player or CD changer connector C-107. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and radio and CD player or CD changer connector C-107. NO: Check radio and CD player or CD changer connector C-107, and repair if necessary. If the radio and CD player or CD changer connector is in good condition, replace the radio and CD player or CD changer.
51. STEP 51. Using scan tool MB991958, diagnose the CAN bus line. (checking the CAN box unit for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect CAN box unit connector C-15. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and CAN box unit connector C-15. NO: Check CAN box unit connector C-15, and repair if necessary. If the CAN box unit connector is in good condition, replace the CAN box unit.
52. STEP 52. Using scan tool MB991958, diagnose the CAN bus line. (checking the satellite radio tuner for internal failure) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Disconnect satellite radio tuner connector C-18. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: Repair the wiring harness between joint connector (CAN1) C-105 and satellite radio tuner connector C-18. NO: Check satellite radio tuner connector C-18, and repair if necessary. If the satellite radio tuner connector is in good condition, replace the satellite radio tuner.
53. STEP 53. Using scan tool MB991958, diagnose the CAN bus line. (trouble symptom check) CAUTION: Strictly observe the specified wiring harness repair procedure. For details refer to «SERVICE PRECAUTIONS»(ref-592596-S32252946362014011000000) . CAUTION: To prevent damage to scan tool MB991958, always turn the ignition switch to the "LOCK" (OFF) position before connecting or disconnecting scan tool MB991958. Connect scan tool MB991958 to the data link connector. Turn the ignition switch to the "ON" position. Diagnose CAN bus lines, and check if the scan tool MB991958 screen is as shown in the illustrations below. OK: The display of the scan tool MB991958 is as shown in the illustration. Q: Does scan tool MB991958 screen correspond to the illustration? YES: The trouble can be an intermittent malfunction (Refer to «HOW TO COPE WITH INTERMITTENT MALFUNCTION»(ref-592586-S21436341472014011000000) ). NO: Check the ETACS-ECU connector C-301, and repair if necessary. If the ETACS-ECU connector is in good condition, replace the ETACS-ECU.

CAN COMMUNICATION-RELATED DTC (U-CODE) TABLE

DIAGNOSTIC ITEM REFERENCE