Multiplex Communication System - Diagnostics: Diagnosis Toyota Sequoia I рестайлинг

HOW TO PROCEED WITH TROUBLESHOOTING

Perform troubleshooting in accordance with the procedure on the following page.

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1. CHECK BODY ECU Disconnect the B5, B6 and B7 ECU connectors. Measure the resistance or voltage of each terminal of the wire harness side connector. Standard: TERMINAL CONDITION SPECIFICATION CHART Symbols (Terminal No.) Wiring Color Terminal Description Condition Specified Condition BDR (B6-2) - Body ground L-W - Body ground +B (BATT) power supply Always 10 to 14 V IG (B7-6) - Body ground B-R - Body ground Ignition power supply Ignition switch ON 10 to 14 V ACC (B7-10) - Body ground GR - Body ground ACC power supply Ignition switch ACC 10 to 14 V OBD2 (B5-2) - Body ground G-R - Body ground Bus "+" line During transmission Pulse generation S+B (B6-1) - Body ground W-L - Body ground +B (BATT) power supply Always 10 to 14 V BECU (B6-5) - Body ground W-R - Body ground +B (BATT) power supply Always 10 to 14 V WIG (B7-5) - Body ground L-Y - Body ground Ignition power supply Ignition switch ON 10 to 14 V MPX3 (B7-20) - Body ground G-O - Body ground MPX line Always 10 k ohm or higher MPX2 (B5-24) - Body ground L-Y - Body ground MPX line Always 10 k ohm or higher MPX1 (B7-22) - Body ground W-L - Body ground MPX line Always 10 kohm or higher GND1 (B6-6) - Body ground W-B - Body ground Ground Always Below 1 ohm PRG - GND1 (B5-5 - B6-6) V - W-B Wireless transmitter signal ground Wireless door look receiver communication circuit - RDA - GND1 (B5-4 - B6-6) R-G - W-B Wireless transmitter signal input Wireless door lock control system is operated Below 1 V RDA - GND1 (B5-4 - B6-6) R-G - W-B Wireless transmitter signal input Wireless door lock control system is not operated 10 to 14 V GSW (B6-16) GR-R Air bag sensor communication signal Air bag sensor communication circuit - CLTS ( (1) ) - GND1 (B6-12 - B6-6) Y - W-B Automatic light control sensor (Signal) Ignition switch OFF Below 1 V CLTS ( (1) ) - GND1 (B6-12 - B6-6) Y - W-B Automatic light control sensor (Signal) Ignition switch ON Signal waveform CLTE ( (1) ) - GND1 (B6-3 - B6-6) BR - W-B Automatic light control sensor (Ground) Always Below 1 V CLTB ( (1) ) - GND1 (B6-4 - B6-6) R-G - W-B Automatic light control sensor (IG) Ignition switch OFF Below 1 V CLTB ( (1) ) - GND1 (B6-4 - B6-6) R-G - W-B Automatic light control sensor (IG) Ignition switch ON 10 to 14 V (1) w/ Automatic Light Control If the result is not as specified, there may be a malfunction on the wire harness side.
2. CHECK DRIVER DOOR ECU Disconnect the D22 ECU connector. Measure the resistance or voltage of each terminal of the wire harness side connector. Standard: TERMINAL CONDITION SPECIFICATION CHART Symbols (Terminals No.) Wiring Color Terminal Description Condition Specified Condition SIG (D22-21) - Body ground B-R - Body ground Ignition power supply Ignition switch ON 10 to 14 V CPUB (D22-23) - Body ground W-R - Body ground +B (BATT) power supply Always 10 to 14 V MPX1 (D22-20) - Body ground G-B - Body ground MPX line Always 10 k ohm or higher MPX2 (D22-8) - Body ground W-L - Body ground MPX line Always 10 k ohm or higher BDR (D22-25) - Body ground L-W - Body ground +B (BATT) power supply Always 10 to 14 V GND (D22-13) - Body ground W-B - Body ground Ground Always Below 1 ohm If the result is not as specified, there may be a malfunction on the wire harness side.
3. CHECK FRONT PASSENGER DOOR ECU Disconnect the F18 ECU connector. Measure the resistance or voltage of each terminal of the wire harness side connector. Standard: TERMINAL CONDITION SPECIFICATION CHART Symbols (Terminals No.) Wiring Color Terminal Description Condition Specified Condition SIG (F18-21) - Body ground B-R - Body ground Ignition power supply Ignition switch ON 10 to 14 V BDR (F18-25) - Body ground L-Y - Body ground +B (BATT) power supply Always 10 to 14 V MPX1 (F18-20) - Body ground B - Body ground MPX line Always 10 k ohm or higher MPX2 (F18-8) - Body ground G-B - Body ground MPX line Always 10 k ohm or higher CPUB (F18-23) - Body ground W-R - Body ground +B (BATT) power supply Always 10 to 14 V GND (F18-13) - Body ground W-B - Body ground Ground Always Below 1 ohm If the result is not as specified, there may be a malfunction on the wire harness side. Disconnect the F18 ECU connector. Measure the resistance or voltage of each terminal of the wire harness side connector. Standard: TERMINAL CONDITION SPECIFICATION CHART Symbols (Terminals No.) Wiring Color Terminal Description Condition Specified Condition SIG (F18-19) - Body ground B-R - Body ground Ignition power supply Ignition switch ON 10 to 14 V BDR (F18-20) - Body ground L-Y - Body ground +B (BATT) power supply Always 10 to 14 V MPX1 (F18-10) - Body ground B - Body ground MPX line Always 10 k ohm or higher MPX2 (F18-11) - Body ground G-B - Body ground MPX line Always 10 k ohm or higher CPUB (F18-12) - Body ground W-R - Body ground +B (BATT) power supply Always 10 to 14 V GND (F18-8) - Body ground W-B - Body ground Ground Always Below 1 ohm If the result is not as specified, there may be a malfunction on the wire harness side.
4. CHECK SLIDING ROOF ECU Disconnect the S19 ECU connector. Measure the resistance or voltage of each terminal of the wire harness side connector. Standard: TERMINAL CONDITION SPECIFICATION CHART Symbols (Terminals No.) Wiring Color Terminal Description Condition Specified Condition IG (S19-8) - Body ground B-R - Body ground Ignition power supply Ignition switch ON 10 to 14 V B (S19-5) - Body ground L-W - Body ground +B (BATT) power supply Always 10 to 14 V MPX1 (S19-2) - Body ground G-O - Body ground MPX line Always 10 k ohm or higher E (S19-7) - Body ground W-B - Body ground Ground Always Below 1 ohm If the result is not as specified, there may be a malfunction on the wire harness side.
5. CHECK BACK DOOR ECU Disconnect the B10 and B11 ECU connectors. Measure the resistance or voltage of each terminal of the wire harness side connector. Standard: TERMINAL CONDITION SPECIFICATION CHART Symbols (Terminals No.) Wiring Color Terminal Description Condition Specified Condition MPX2 (B11-1) - Body ground B - Body ground MPX line Always 10 k ohm or higher MPX1 (B11-2) - Body ground LG-R - Body ground MPX line Always 10 k ohm or higher GND (B11-3) - Body ground W-B - Body ground Ground Always Below 1 ohm BDR (B11-4) - Body ground L-W - Body ground +B (BATT) power supply Always 10 to 14 V BECU (B11-5) - Body ground W-R - Body ground +B (BATT) power supply Always 10 to 14 V SIG (B11-6) - Body ground B-R - Body ground Ignition power supply Ignition switch ON 10 to 14 V If the result is not as specified, there may be a malfunction on the wire harness side.
6. CHECK COMBINATION METER Disconnect the C5 and C6 meter connectors. Measure the resistance or voltage of each terminal of the wire harness side connector. Standard: TERMINAL CONDITION SPECIFICATION CHART Terminals No. Wiring Color Terminal Description Condition Specified Condition C6-24 - Body ground B-O - Body ground Ignition power supply Ignition switch ON 10 to 14 V C6-23 - Body ground W-R - Body ground +B (BATT) power supply Always 10 to 14 V C5-30 - Body ground W - Body ground MPX line Always 10 k ohm or higher C5-31 - Body ground LG-R - Body ground MPX line Always 10 k ohm or higher C5-32 - Body ground LG-B - Body ground MPX line Always 10 k ohm or higher C6-12 - Body ground BR - Body ground Ground Always Below 1 ohm C5-28 - Body ground B-R - Body ground Ignition power supply Ignition switch ON 10 to 14 V If the result is not as specified, there may be a malfunction on the wire harness side.
7. CHECK MEMORY SEAT ECU & SWITCH (w/ Driving Position Memory) Disconnect the M6 and M7 ECU connectors. Measure the resistance or voltage of each terminal of the wire harness side connector. Standard: TERMINAL CONDITION SPECIFICATION CHART Symbols (Terminals No.) Wiring Color Terminal Description Condition Specified Condition MPX1 (M6-1) - Body ground W - Body ground MPX line Always 10 k ohm or higher IG (M6-4) - Body ground B-R - Body ground Ignition power supply Ignition switch ON 10 to 14 V SYSB (M6-8) - Body ground W-R - Body ground +B (BATT) power supply Always 10 to 14 V GND (M7-1) - Body ground W-B - Body ground Ground Always Below 1 ohm +B (M7-5) - Body ground L-O - Body ground +B (BATT) power supply Always 10 to 14 V If the result is not as specified, there may be a malfunction on the wire harness side.
8. CHECK A/C ECU (INTEGRATION CONTROL AND PANEL) Disconnect the I19 ECU connector. Measure the resistance or voltage of each terminal of the wire harness side connector. Standard: TERMINAL CONDITION SPECIFICATION CHART Symbols (Terminals No.) Wiring Color Terminal Description Condition Specified Condition +B (I19-1) - Body ground R - Body ground +B (BATT) power supply Always 10 to 14 V IG+ (I19-2) - Body ground R-L - Body ground Ignition power supply Ignition switch ON 10 to 14 V ACC (I19-11) - Body ground P - Body ground ACC power supply Ignition switch ACC 10 to 14 V MPX+ (I19-3) - Body ground L-Y - Body ground MPX line Always 10 k ohm or higher MPX- (I19-13) - Body ground LG-B - Body ground MPX line Always 10 k ohm or higher GND (I19-10) - Body ground O - Body ground Ground Always Below 1 ohm If the result is not as specified, there may be a malfunction on the wire harness side.

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1. DIAGNOSIS SYSTEM Inspect the battery voltage. Battery voltage: 11 to 14 V If voltage is below 11 V, recharge the battery before proceeding. Check the DLC3. The body ECU uses ISO 9141-2 for communication. The terminal arrangement of the DLC3 complies with SAE J1962 and matches the ISO 9141-2 format. Verify the conditions listed in the table below: TERMINAL CONDITION SPECIFICATION CHART Symbols (Terminals No.) Terminal Description Condition Specified Condition SIL(7) - SG(5) Bus "+" line During communication Pulse generation SG(5) - Body ground Signal ground Always Below 1 ohm BAT(16) - Body ground Battery positive Always 11 to 14 V HINT: If the hand-held tester display shows UNABLE TO CONNECT TO VEHICLE when the cable of the hand-held tester is connected to the DLC3, the ignition switch is turned to the ON position and the tester is operated, there is a problem on either the vehicle side or the tester side. If communication is normal when the tester is connected to another vehicle, inspect the DLC3 on the original vehicle. If communication is still not possible when the tool is connected to another vehicle, the problem is probably in the tester itself, so consult the Service Department listed in the tester's instruction manual.

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1. DTC CHECK Checking DTCs using the hand-held tester. Connect the hand-held tester to the DLC3. Turn the ignition switch ON. Read DTCs by following the prompts on the tester screen. HINT: Refer to the hand-held tester operator's manual for further details.
2. DTC CLEARANCE A multiplex DTC indicates that a problem has been detected in the multiplex communication system. Once the problem is solved and the system begins to operate as designed, the DTC will be cleared automatically. There is no need to manually clear a multiplex DTC using the hand-held tester.

DIAGNOSTIC TROUBLE CODE CHART

DIAGNOSTIC TROUBLE CODES (DTC) LIST

If a trouble code is indicated during the DTC check, check the components listed for that code in the table below (proceed to the page given for that code).

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HINT

1. When either DTC B1214 or B1215 is output, a DTC for another ECU communication stop may also be output. In this case, perform troubleshooting for DTC B1214 or B1215 first. DTC B1214 or B1215 is output when a short to +B or short to ground occurs on a communication bus.
2. DTCs from B1221 to B1241 do not indicate that the corresponding switch is abnormal. They notify how the switch is operating. If the corresponding DTC is not indicated when operating a switch, there is a problem with the switch contact. If a DTC is indicated when not operating switches, the corresponding switch is stuck.

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CIRCUIT DESCRIPTION

This DTC is indicated when communication fails between the driver door ECU and body ECU.

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INSPECTION PROCEDURE

1. Check driver door ECU. CHECK: Check if the driver door window glass auto up function operates normally through the power window master switch. HINT: With this inspection, the driver door ECU CPU can be diagnosed if it works normally or not. OK: Driver door side power window auto up function operates normally. NG: Go to power source circuit (See «CIRCUIT INSPECTION»(ref-227574-S19810838272006040600000) ). OK: Go to next step.
2. Check wire harness and connector (Driver door ECU - body ECU and driver door ECU - passenger door ECU). PREPARATION: Disconnect connector "B7" of the body ECU, "D22" of the driver door ECU and "F18" the passenger door ECU. CHECK: Measure the resistance according to the values in the table below. OK: TESTER CONDITION SPECIFICATION CHART Symbols (Tester connection) Condition Specified condition MPX1 (B7-22) - MPX2 (D22-8) Always Below 1 ohm MPX1 (D22-20) - MPX2 (F18-11) Always Below 1 ohm MPX1 (B7-22) - Body ground Always 10 k ohm or higher MPX1 (D22-20) - Body ground Always 10 k ohm or higher NG: Repair or replace wire harness. OK: Replace the driver door ECU. If the problem reoccurs even after replacement, replace the body ECU.

This DTC is indicated when communication fails between the passenger door ECU and body ECU.

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1. Check driver door ECU. CHECK: Check if the driver door window glass auto up function operates normally through the power window master switch. HINT: With this inspection, the driver door ECU CPU can be diagnosed if it works normally or not. OK: Driver door side power window auto up function operates normally. NG: Go to power source circuit (See «CIRCUIT INSPECTION»(ref-227574-S19810838272006040600000) ). OK: Go to next step.
2. Check wire harness and connector (Driver door ECU - body ECU and driver door ECU - passenger door ECU). PREPARATION: Disconnect connector "B7" of the body ECU, "D22" of the driver door ECU and "F18" the passenger door ECU. CHECK: Measure the resistance according to the values in the table below. OK: TESTER CONNECTION SPECIFIED CONDITION CHART Symbols (Tester connection) Condition Specified condition MPX1 (B7-22) - MPX2 (D22-8) Always Below 1 ohm MPX1 (D22-20) - MPX2 (F18-11) Always Below 1 ohm MPX1 (B7-22) - Body ground Always 10 k ohm or higher MPX1 (D22-20) - Body ground Always 10 k ohm or higher NG: Repair or replace wire harness. OK: Replace the driver door ECU. If the problem reoccurs even after replacement, replace the body ECU.

This DTC is indicated when communication fails between the passenger door ECU and body ECU.

1. Check passenger door ECU. CHECK: Check if the passenger door window glass auto up function operates normally through the front passenger door window switch. HINT: With this inspection, the passenger door ECU CPU can be diagnosed if it works normally or not. OK: Front passenger side power window auto up function operates normally. NG: Go to power source circuit (See «CIRCUIT INSPECTION»(ref-227575-S04511697972006040600000) ). OK: Go to next step.
2. Check wire harness and connector (Passenger door ECU - driver door ECU, back door ECU). PREPARATION: Disconnect connector "D22" of the driver door ECU, "F18" of the passenger door ECU and "B11" of the back door ECU. CHECK: Measure the resistance according to the values in the table below. OK: TESTER CONNECTION SPECIFIED CONDITION CHART Symbols (Tester connection) Condition Specified condition MPX1 (D22-20) - MPX2 (F18-8) ( (1) ) Always Below 1 ohm MPX1 (D22-20) - MPX2 (F18-11) ( (2) ) Always Below 1 ohm MPX2 (B11-1) - MPX1 (F18-20) ( (1) ) Always Below 1 ohm MPX2 (B11-1) - MPX1 (F18-10) ( (2) ) Always Below 1 ohm MPX1 (D22-20) - Body ground Always 10 k ohm or higher MPX1 (B11-1) - Body ground Always 10 k ohm or higher (1) w/ Driving Position Memory (2) w/o Driving Position Memory NG: Repair or replace wire harness. OK: Replace the passenger door ECU. If the problem reoccurs even after replacement, replace the body ECU.

DTC B1214 or B1215 is detected when a short to +B or short to ground occurs on the multiplex communication bus (BEAN). Detecting this condition will disable the multiplex communication bus (BEAN) and output the corresponding DTC.

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1. Check apparatus. CHECK: Choose the apparatus to be inspected. APPARATUS CHART Apparatus Go to step w Sliding roof A Two Sliding roof B B: Go to step 4 A: Go to next step.
2. Check the communication circuit inside the sliding roof control ECU. PREPARATION: Disconnect connector "S19" of the sliding roof control ECU. CHECK: Check the DTC (See «DTC CHECK/CLEAR»(ref-227577-S31448886252006040600000) ). OK: DTCs B1214 and/or B1215 are not indicated. HINT: Ignore any codes other than DTCs B1214 and B1215. OK: Replace sliding roof control ECU. NG: Go to next step.
3. Check for a short circuit between the sliding control ECU and body ECU. PREPARATION: Reconnect connector "S19" of the sliding roof control ECU (only vehicles w/ sliding roof). Disconnect connector "B7" of the body ECU. CHECK: Check the DTC (See «DTC CHECK/CLEAR»(ref-227577-S31448886252006040600000) ). OK: DTCs B1214 and/or B1215 are not indicated. HINT: Ignore any codes other than DTCs B1214 and B1215. OK: Repair or replace the wire harness between the sliding roof control ECU and body ECU. NG: Go to next step.
4. Check the communication circuit inside the driver door ECU. PREPARATION: Reconnect connector "B7" of the body ECU (only vehicles w/ sliding roof). Disconnect connector "D22" of the driver door ECU. CHECK: Check the DTC (See «DTC CHECK/CLEAR»(ref-227577-S31448886252006040600000) ). OK: DTCs B1214 and/or B1215 are not indicated. HINT: Ignore any codes other than DTCs B1214 and B1215. OK: Replace the driver door ECU. NG: Go to next step.
5. Check the communication circuit inside the front passenger door ECU. PREPARATION: Reconnect connector "D22" of the driver door ECU. Disconnect connector "F18" of the front passenger door ECU. CHECK: Check the DTC (See «DTC CHECK/CLEAR»(ref-227577-S31448886252006040600000) ). OK: DTCs B1214 and/or B1215 are not indicated. HINT: Ignore any codes other than DTCs B1214 and B1215. OK: Replace the front passenger door ECU. NG: Go to next step.
6. Check for a short circuit between the driver door ECU and front passenger door ECU. PREPARATION: Disconnect connector "D22" of the driver door ECU. CHECK: Check the DTC (See «DTC CHECK/CLEAR»(ref-227577-S31448886252006040600000) ). OK: DTCs B1214 and/or B1215 are not indicated. HINT: Ignore any codes other than DTCs B1214 and B1215. OK: Repair or replace the wire harness between the driver door ECU and front passenger door ECU. NG: Go to next step.
7. Check communication circuit inside the back door ECU. PREPARATION: Reconnect connector "D22" of the driver door ECU. Reconnect connector "F18" of the passenger door ECU. Disconnect connector "B11" of the back door ECU. CHECK: Check the DTC (See «DTC CHECK/CLEAR»(ref-227577-S31448886252006040600000) ). OK: DTCs B1214 and/or B1215 are not indicated. HINT: Ignore any codes other than DTCs B1214 and B1215. OK: Replace the back door ECU. NG: Go to next step.
8. Check for a short circuit between the front passenger door ECU and back door ECU. PREPARATION: Disconnect connector "F18" of the front passenger door ECU. CHECK: Check the DTC (See «DTC CHECK/CLEAR»(ref-227577-S31448886252006040600000) ). OK: DTCs B1214 and/or B1215 are not indicated. HINT: Ignore any codes other than DTCs B1214 and B1215. OK: Repair or replace the wire harness between the front passenger door ECU and back door ECU. NG: Go to next step.
9. Check the communication circuit inside the integration control and panel. PREPARATION: Reconnect connector "F18" of the passenger door ECU. Reconnect connector "B11" of the back door ECU. Disconnect connector "I19" of the integration control and panel. CHECK: Check the DTC (See «DTC CHECK/CLEAR»(ref-227577-S31448886252006040600000) ). OK: DTCs B1214 and/or B1215 are not indicated. HINT: Ignore any codes other than DTCs B1214 and B1215. OK: Replace the integration control and panel. NG: Go to next step.
10. Check for a short circuit between the integration control and the panel and the body ECU. PREPARATION: Disconnect connector "B5" of the body ECU. CHECK: Check the DTC (See «DTC CHECK/CLEAR»(ref-227577-S31448886252006040600000) ). OK: DTCs B1214 and/or B1215 are not indicated. HINT: Ignore any codes other than DTCs B1214 and B1215. OK: Repair or replace the wire harness between the integration control and panel and the body ECU. NG: Go to next step.
11. Check apparatus. CHECK: Choose the apparatus to be inspected. APPARATUS CHART Apparatus Go to step w/ Driving position memory A w/o Driving position memory B B: Go to step 14 A: Go to next step.
12. Check the communication circuit inside the memory seat ECU & switch. PREPARATION: Reconnect connector "I19" of the integration control and panel. Reconnect connector "B5" of the body ECU. Disconnect connector "M6" of the memory seat ECU & switch. CHECK: Check the DTC (See «DTC CHECK/CLEAR»(ref-227577-S31448886252006040600000) ). OK: DTCs B1214 and/or B1215 are not indicated. HINT: Ignore any codes other than DTCs B1214 and B1215. OK: Replace the memory seat ECU & switch. NG: Go to next step.
13. Check for a short circuit between the memory seat ECU and switch & combination meter. PREPARATION: Disconnect connector "C5" of the combination meter. CHECK: Measure the resistance according to the value(s) in the table below. OK: SYMBOL CONDITION SPECIFICATION Symbols (Tester connection) Condition Specified condition MPX1 (M6-1) - Body ground Always 10 kohm or higher NG: Repair or replace the wire harness between the memory seat ECU & switch and combination meter. OK: Go to next step.
14. Check the communication circuit inside the combination meter ECU. PREPARATION: Reconnect connector "M6" of the memory seat ECU & switch (only vehicles w/ driving position memory). Reconnect connector "I19" of the integration control and panel (only vehicles w/o driving position memory). Reconnect connector "B5" of the body ECU (only vehicles w/o driving position memory). Disconnect connector "C5" of the combination meter ECU (only vehicles w/o driving position memory). CHECK: Check the DTC (See «DTC CHECK/CLEAR»(ref-227577-S31448886252006040600000) ). OK: DTCs B1214 and/or B1215 are not indicated. HINT: Ignore any codes other than DTCs B1214 and B1215. OK: Replace the combination meter ECU. NG: Go to next step.
15. Check for a short circuit between the combination meter ECU and back door ECU. PREPARATION: Disconnect connector "B11" of the back door ECU. CHECK: Check the DTC (See «DTC CHECK/CLEAR»(ref-227577-S31448886252006040600000) ). OK: DTCs B1214 and/or B1215 are not indicated. HINT: Ignore any codes other than DTCs B1214 and B1215. OK: Repair or replace the wire harness between the combination meter ECU and back door ECU. NG: Go to next step.
16. Check for a short circuit between the combination meter and the integration control and panel. PREPARATION: Reconnect connector "B11" of the back door ECU. Disconnect connector "I19" of the integration control and panel. CHECK: Check the DTC (See «DTC CHECK/CLEAR»(ref-227577-S31448886252006040600000) ). OK: DTCs B1214 and/or B1215 are not indicated. HINT: Ignore any codes other than DTCs B1214 and B1215. OK: Repair or replace the wire harness between the combination meter and the integration control and panel. NG: Go to next step.
17. Check for a short circuit between the body ECU and driver door ECU. PREPARATION: Reconnect connector "I19" of the integration control and panel. Reconnect connector "C5" of the combination meter. Disconnect connector "D22" of the driver door ECU. Disconnect connector "B6" of the body ECU. CHECK: Check the DTC (See «DTC CHECK/CLEAR»(ref-227577-S31448886252006040600000) ). OK: DTCs B1214 and/or B1215 are not indicated. HINT: Ignore any codes other than DTCs B1214 and B1215. OK: Repair or replace the wire harness between the body ECU and driver door ECU. NG: Replace the body ECU.

This DTC is output only if the power window master switch AUTO UP/DOWN operation is performed. If the DTC is not output, the following may be malfunctioning

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HINT

For details of inspection, see PROBLEM SYMPTOMS TABLE .

If the problem reoccurs even after replacement, replace the body ECU.

This DTC is output while the body ECU senses the door unlock state through the door unlock detection switch, which is built into the door lock motor.

If the DTC is not output, the following may be malfunctioning

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HINT

For details of inspection, see PROBLEM SYMPTOMS TABLE .

If the problem reoccurs even after replacement, replace the body ECU.

This DTC is output only if the power window switch AUTO UP/DOWN operation is performed. If the DTC is not output, the following may be malfunctioning

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HINT

For details of inspection, see PROBLEM SYMPTOMS TABLE .

If the problem reoccurs even after replacement, replace the body ECU.

This DTC is output while the body ECU senses the door lock state through the door unlock detection switch, which is built into the door lock motor.

If the DTC is output, the following may be malfunctioning

Scheme 30

HINT

For details of inspection, see PROBLEM SYMPTOMS TABLE .

If the problem reoccurs even after replacement, replace the body ECU.

This DTC is output while the body ECU senses the limit position through the limit switch, which is built into the power window motor.

If the DTC is not output, the following may be malfunctioning

Scheme 31

HINT

For details of inspection, see PROBLEM SYMPTOMS TABLE .

If the problem reoccurs even after replacement, replace the body ECU.

This DTC is output while the body ECU senses switch position information through the pulse switch, which is built into the power window motor.

If the DTC is not output when the power window operates, the following may be malfunctioning

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HINT

For details of inspection, see PROBLEM SYMPTOMS TABLE .

If the problem reoccurs even after replacement, replace the body ECU.

This DTC is output while the body ECU senses the limit position through the limit switch, which is built into the power window motor.

If the DTC is not output, the following may be malfunctioning

Scheme 33

HINT

For details of inspection, see PROBLEM SYMPTOMS TABLE .

If the problem reoccurs even after replacement, replace the body ECU.

This DTC is output while the body ECU senses switch position information through the pulse switch, which is built into the power window motor.

If the DTC is not output when the power window operates, the following may be malfunctioning

Scheme 34

HINT

For details of inspection, see PROBLEM SYMPTOMS TABLE .

If the problem reoccurs even after replacement, replace the body ECU.

This DTC notifies how the switch works as follows

If the DTC is not indicated when operating the back door power window switch or rear wiper and washer switch, it means failure of switch contact. If the DTC is indicated when not operating the back door power window switch or rear wiper and washer switch, it means the switch is stick. When something wrong is found by this diagnosis, inspect each switch. Replace the switch if there is a problem, or check the wire harness if there is no problem.

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HINT

For details of inspection, see PROBLEM SYMPTOMS TABLE .

If the problem reoccurs even after replacement, replace the body ECU.

This DTC is indicated when ground short of the RDA terminal is detected.

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1. Check wire harness and connector (Wireless door lock control receiver - body ECU). PREPARATION: Disconnect the receiver and body ECU connectors. CHECK: Measure the resistance according to the value(s) in the table below. OK: TESTER CONNECTION SPECIFICATION Tester connection (Symbol) Condition Specification B5-4 (RDA) - Body ground Always 10 kohm or higher NG: Repair or replace the wire harness. OK: Go to next step.
2. Check body ECU. PREPARATION: Reconnect the body ECU connector. CHECK: Check the DTC (See «DTC CHECK/CLEAR»(ref-227577-S31448886252006040600000) ). OK: DTC B1242 is not indicated. HINT: Ignore any codes other than DTC B1242. NG: Replace the body ECU. OK: Replace the wireless door lock control receiver.

This DTC is indicated when open or ground short of the GSW terminal is detected.

Scheme 40

Scheme 41

1. Check for open and short in wire harness and connector between body ECU and airbag sensor assembly. PREPARATION: Disconnect connector "A20" of the airbag sensor assembly and connector "B6" of the body ECU. CHECK: Check for an open or short circuit in the harness and connector between the airbag sensor assembly and body ECU. OK: There is no open or short circuit in the wire harness. NG: Repair or replace wire harness or connector. OK: Go to next step.
2. Check the body ECU. PREPARATION: Check that DTC B1243 is indicated when another body ECU in good condition is installed. CHECK: Check if DTC B1243 is indicated after replacing the body ECU. OK: DTCs B1243 is not indicated. NG: Replace the airbag sensor assembly. OK: Replace the body ECU (Original body ECU is failure).

This DTC is indicated when failure of the light sensor circuit is detected.

Scheme 42

Scheme 43

1. Check automatic light control sensor. Using hand-held tester: PREPARATION: Connect the hand-held tester to the DLC3. Turn the ignition switch ON and hand-held tester main switch ON. BODY ECU: ITEM MEASURED CONDITION Item Measurement Item/Display (Range) Normal Condition Diagnostic Note ILLUMINATE RATE Illumination rate information/MIN: 0 MAX: 99.99 Condition value will be displayed Normal value: 0.8 ms to 22.0 ms CHECK: The value of the illumination rate should change in the following range when the light sensor is exposed to the light or covered by a hand. OK: 0.8 ms to 22.0 ms HINT: This is the time to be taken for the light sensor to generate one cycle of frequency according to the brightness. When not using hand-held tester (See «INSPECTION»(ref-227608-S42055615702006040600000) ) NG: Replace the automatic light control sensor. OK: Go to next step.
2. Check wire harness and connector between Automatic Light Control Sensor and Body ECU. PREPARATION: Disconnect connector "A27" of the automatic light control sensor and connector "B6" of the body ECU. CHECK: Measure the resistance according to the values in the table below. OK: TESTER CONNECTION SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition A27-4 - B6-12 (CLTS) Always Below 1 ohm A27-1 - B6-4 (CLTB) Always Below 1 ohm A27-3 - B6-3 (CLTE) Always Below 1 ohm A27-4 - Body ground Always 10 k ohm or higher A27-1 - Body ground Always 10 k ohm or higher A27-3 - Body ground Always 10 k ohm or higher NG: Repair or replace wire harness or connector. OK: Replace the body ECU.

This DTC is indicated when communication fails between the integration control and panel and the body ECU.

Scheme 44

Scheme 45

1. Check air conditioning system. CHECK: Check the operation of the air conditioning system. OK: The air conditioning system operates normally. NG: Go to air conditioning system (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-227582-S27145581162006040600000) ). OK: Go to next step.
2. Check wire harness (Integration control and panel - combination meter, integration control and panel - body ECU). PREPARATION: Disconnect connector "B5" of the body ECU connector, "I19" of the integration control and panel and connector "C5" of the combination meter. CHECK: Measure the resistance according to the values in the table below. OK: TESTER CONNECTION SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition C5-32 - I19-13 (MPX-) Always Below 1 ohm B5-24 (MPX2) - I19-3 (MPX+) Always Below 1 ohm C5-32 - Body ground Always 10 k ohm or higher B5-24 (MPX2) - Body ground Always 10 k ohm or higher NG: Repair or replace wire harness. OK: Replace integration control and panel. If the problem recurs even after replacement, replace the body ECU.

This DTC is indicated when communication fails between the combination meter and body ECU.

Scheme 46

Scheme 47

1. Check combination meter. CHECK: Start the engine and check that the speed meter and tachometer operate normally. HINT: With this inspection, the combination meter CPU can be diagnosed if it works normally or not. OK: Speed meter and tachometer operate normally. NG: Go to combination system (See «HOW TO PROCEED WITH TROUBLESHOOTING»(ref-227584-S10574870062006040600000) ). OK: Go to next step.
2. Check wire harness and connector (Combination meter - back door ECU, combination meter - integration control and panel). PREPARATION: Disconnect connector "B11" of the back door ECU, connector "C5" of the combination meter and connector "I19" of the integration control and panel. CHECK: Measure the resistance according to the values in the table below. OK: TESTER CONNECTION SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition B11-2 (MPX1) - C5-31 Always Below 1 ohm I19-13 (MPX-) - C5-32 Always Below 1 ohm B11-2 (MPX1) - Body ground Always 10 kohm or higher I19-13 (MPX-) - Body ground Always 10 kohm or higher NG: Repair or replace wire harness. OK: Replace the combination meter. If the problem recurs even after replacement, replace the body ECU.

This DTC is indicated when communication fails between the memory seat ECU & switch and body ECU.

Scheme 48

Scheme 49

1. Check power seat control system (w/ driving position memory). CHECK: Check the operation of the power seat. OK: The power seat control system operates normally. NG: Go to power source circuit (See «CIRCUIT INSPECTION»(ref-227585-S25110161452006040600000) ). OK: Go to next step.
2. Check wire harness (Memory seat ECU & switch - combination meter). PREPARATION: Disconnect connector "M6" of the memory seat ECU and "C5" of the combination meter. CHECK: Measure the resistance according to the values in the table below. OK: TESTER CONNECTION SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition M6-1 (MPX1) - C5-30 Always Below 1 ohm M6-1 (MPX1) - Body ground Always 10 k ohm or higher NG: Repair or replace wire harness or connector. OK: Replace memory seat ECU & switch. If the problem recurs even after replacement, replace the body ECU.

This DTC is indicated when communication fails between the sliding roof ECU and body ECU.

Scheme 50

Scheme 51

1. Check sliding roof ECU. CHECK: Check that the operation of the sliding roof function is normal. HINT: The operating condition of the sliding roof ECU CPU can be diagnosed with this check. OK: The sliding roof operates normally. NG: Go to power source circuit (See «CIRCUIT INSPECTION»(ref-227572-S18259341232006040600000) ). OK: Go to next step.
2. Check wire harness and connector (Sliding roof control ECU - body ECU). PREPARATION: Disconnect connector "B7" of the body ECU and connector "S19" of the sliding roof ECU. CHECK: Measure the resistance according to the values in the table below. OK: TESTER CONNECTION SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition S19-2 (MPX1) - B7-20 (MPX3) Always Below 1 ohm S19-2 (MPX1) - Body ground Always 10 k ohm or higher NG: Repair or replace wire harness. OK: Replace the sliding roof ECU. If the problem recurs even after replacement, replace the body ECU.

This DTC is indicated when communication fails between the back door ECU and body ECU.

Scheme 52

Scheme 53

1. Check back door ECU. CHECK: Check that the operation of the rear wiper motor function is normal. HINT: With this inspection, the back door ECU CPU can be diagnosed if it works normally or not. OK: Rear wiper motor operates normally. NG: Replace the back door ECU. OK: Go to next step.
2. Check wire harness and connector (Back door ECU - combination meter, back door ECU - passenger door ECU). PREPARATION: Disconnect connector "F18" of the passenger door ECU, connector "B11" of the back door ECU and connector "C5" of the combination meter ECU. CHECK: Measure the resistance according to the values in the table below. OK: TESTER CONNECTION SPECIFIED CONDITION Tester connection (Symbols) Condition Specified condition B11-2 (MPX1) - C5-31 Always Below 1 ohm B11-1 (MPX2) - F18-10 ( (1) ) Always Below 1 ohm B11-1 (MPX2) - F18-20 ( (2) ) Always Below 1 ohm B11-1 (MPX2) - Body ground Always 10 k ohm or higher B11-2 (MPX1) - Body ground Always 10 k ohm or higher (1) w/ Driving Position Memory (2) w/o Driving Position Memory NG: Repair or replace wire harness. OK: Replace the back door ECU. If the problem recurs even after replacement, replace the body ECU.