Module Communications Network: Diagnosis Ford Explorer IV

Inspection and Verification

1. Verify the customer concern.
2. Visually inspect the following for obvious signs of electrical damage. VISUAL INSPECTION CHART Electrical Battery junction box (BJB) fuse(s): 3 (50A) (no communication with smart junction box [SJB]) 6 (40A) (no communication with anti-lock brake system [ABS] module) 19 (30A) (no communication with power running board module) 23 (20A) (no communication with four wheel drive [4WD] control module) 24 (10A) (no communication with powertrain control module [PCM]) 26 (20A) (no communication with 4WD control module) 27 (20A) (no communication with transmission control module [TCM]) 33 (30A) (no communication with ABS module) 39 (15A) (no communication with PCM) 41 (15A) (no communication with satellite radio receiver, digital versatile disc [DVD]) Smart junction box (SJB) fuse(s): 1 (20A) (no communication with driver seat module [DSM]) 2 (5A) (no communication with SJB) 3 (20A) (no communication with audio unit) 4 (20A) (no power to scan tool) 8 (15A) (no communication with instrument cluster) 9 (2A) (no communication with TCM) 12 (5A) (no communication with audio unit) 17 (10A) (no communication with restraints control module [RCM], occupant classification sensor module) 18 (10A) (no communication with ABS module, 4WD control module, parking aid module) 20 (10A) (no communication with electronic automatic temperature control [EATC]) module 24 (10A) (no communication with instrument cluster) 28 (10A) (no communication with EATC module) Data link connector (DLC) Wiring harness Circuitry
3. If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
4. If the cause is not visually evident, connect the scan tool to the DLC. If the scan tool does not communicate with the VCM: Check the VCM connection to the vehicle. Check the scan tool connection to the VCM. Go to «Pinpoint Test R»(ref-270934-S23647778552007110700000) , to diagnose no power to the scan tool.
5. Carry out the network test: If the network test passes, retrieve and record the continuous memory DTCs and proceed to Step 6. If the network test fails, go to «Symptom Chart»(ref-270934-S12538838182007111500000) to identify the module not communicating.
6. If the DTCs retrieved are related to the concern, go to the Communication Network Diagnostic Trouble Code (DTC) Chart. For all other DTCs, refer to «MULTIFUNCTION ELECTRONIC MODULES»(ref-270935) .
7. If no DTCs related to the concern are retrieved, go to «Symptom Chart»(ref-270934-S12538838182007111500000) .

Note. DTC U1900 will set in a module that is reporting a communication fault from another module on the data bus. The module that reports the fault is not the problem module.

COMMUNICATION NETWORK DIAGNOSTIC TROUBLE CODES (DTC) CHART

Symptom Chart

Symptom Chart

Pinpoint Test A: The Powertrain Control Module (PCM) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS , Electronic Engine Controls - 4.0L for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS , Electronic Engine Controls - 4.6L for schematic and connector information.

Scheme 3

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1. A1 POWERTRAIN CONTROL/EMISSIONS DIAGNOSIS (PC/ED) MANUAL PINPOINT TEST QA VERIFICATION CHECK Verify that pinpoint test QA has been performed. Has pinpoint test QA been performed? YES : Go to A2 . NO : REFER to the «Introduction - Gasoline Engines»(ref-268480) , Section 5, pinpoint test QA to diagnose no communication with the PCM.
2. A2 CHECK THE HS-CAN TERMINATION RESISTANCE Key in OFF position. NOTE: Failure to disconnect the battery will result in false resistance readings. Disconnect the battery ground cable. Measure the resistance between the data link connector (DLC) C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance between 54 and 66 ohms? YES : Go to A4 . NO : Go to A3 .
3. A3 CHECK THE CAN CIRCUITS BETWEEN THE DLC AND THE PCM FOR AN OPEN Measure the resistance between the PCM C175b-11, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the PCM C175b-23, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to A4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. A4 CHECK FOR CORRECT PCM OPERATION Disconnect all the PCM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the PCM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-270955) . CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test B: The Transmission Control Module (TCM) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS , Transmission Controls - 6R60 for schematic and connector information.

Scheme 6

Scheme 7

1. B1 CHECK THE TCM VOLTAGE SUPPLY CIRCUITS FOR AN OPEN Key in OFF position. Disconnect: TCM C199 (6R60 Transmission) Key in ON position. Measure the voltage between the TCM, harness side and ground as follows: TCM Connector-Pin Circuit C199-9 CE517 (BU/GN) C199-14 SBB27 (BU/RD) Are the voltages greater than 10 volts? YES : Go to B2 . NO : VERIFY that the battery junction box (BJB) fuse 27 (20A) or smart junction box (SJB) fuse 9 (2A) is OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. B2 CHECK THE TCM GROUND CIRCUITS FOR AN OPEN Key in OFF position. Measure the resistance between the TCM, harness side and ground as follows: TCM Connector-Pin Circuit C199-13 GD113 (BK/YE) C199-16 GD113 (BK/YE) Are the resistances less than 5 ohms? YES : Go to B3 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. B3 CHECK THE HS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE TCM FOR AN OPEN Measure the resistance between the TCM C199-6, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the TCM C199-2, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to B4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. B4 CHECK FOR CORRECT TCM OPERATION Disconnect the TCM connector. Check for: corrosion damaged pins pushed-out pins Connect the TCM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new TCM. REFER to «AUTOMATIC TRANSAXLE/TRANSMISSION - 6R60»(ref-270910) , mechatronic assembly. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test C: The Anti-Lock Brake System (ABS) Module Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS , Vehicle Dynamic Systems for schematic and connector information.

Scheme 8

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1. C1 CHECK THE ABS VOLTAGE SUPPLY CIRCUITS FOR AN OPEN Key in OFF position. Disconnect: ABS Module C155 Key in ON position. Measure the voltage between the ABS module, harness side and ground as follows: Connector-Pin Circuit C155-1 SBB06 (BN/RD) C155-8 CBP18 (GY/OG) C155-32 SBB33 (RD) Are the voltages greater than 10 volts? YES : Go to C2 . NO : VERIFY the battery junction box (BJB) fuse 6 (40A) or fuse 33 (30A) and the smart junction box (SJB) fuse 18 (10A) is OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. C2 CHECK THE ABS GROUND CIRCUIT GD120 (BK/GN) FOR AN OPEN Key in OFF position. Measure the resistance between the ABS module C155-16, circuit GD120 (BK/GN) harness side and ground. Is the resistance less than 5 ohms? YES : Go to C3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. C3 CHECK THE HS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE ABS MODULE FOR AN OPEN Measure the resistance between the ABS module C135-12, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the ABS module C135-13, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to C4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. C4 CHECK FOR CORRECT ABS MODULE OPERATION Disconnect the ABS module connector. Check for: corrosion damaged pins pushed-out pins Connect the ABS module connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new ABS module. REFER to «VEHICLE DYNAMIC SYSTEMS»(ref-270960) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test D: The Restraints Control Module (RCM) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS , Supplemental Restraint System for schematic and connector information.

Note. The supplemental restraint system (SRS) must be fully operational and free of faults before releasing the vehicle to the customer.

Note. Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test.

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1. D1 CHECK THE RCM CONNECTION Key in OFF position. Depower the SRS. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . Disconnect: RCM C310a Disconnect: RCM C310b Are RCM C310a pin 24 and RCM C310b pins 17 and 18 OK? YES : Go to D2 . NO : REPAIR the RCM connector pins as necessary. REPOWER the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . CLEAR the DTCs. REPEAT the network test with the scan tool.
2. D2 CHECK THE RCM VOLTAGE SUPPLY CIRCUIT CBP17 (BN/GN) FOR AN OPEN Deactivate the SRS. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . Repower the SRS. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . Key in ON position. Measure the voltage between the RCM C310a-24, circuit CBP17 (BN/GN), harness side and ground. Is the voltage greater than 10 volts? YES : Go to D3 . NO : VERIFY the smart junction box (SJB) fuse 17 (10A) is OK. If OK, REPAIR the circuit. REACTIVATE the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . CLEAR the DTCs. REPEAT the network test with the scan tool.
3. D3 CHECK THE RCM CASE GROUND Key in OFF position. Measure the resistance between the RCM case and a good chassis ground. Is the resistance less than 5 ohms? YES : Go to D4 . NO : REPAIR the RCM case ground as necessary. REACTIVATE the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . CLEAR the DTCs. REPEAT the network test with the scan tool.
4. D4 CHECK THE HS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE RCM FOR AN OPEN Measure the resistance between the RCM C310b-18, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the RCM C310b-17, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to D5 . NO : REPAIR the circuit in question. REACTIVATE the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . CLEAR the DTCs. REPEAT the network test with the scan tool.
5. D5 CHECK FOR CORRECT RCM OPERATION Disconnect all the RCM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the RCM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new RCM. REACTIVATE the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. REACTIVATE the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test E: The Four Wheel Drive (4WD) Control Module Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS , Four Wheel Drive Systems for schematic and connector information.

Scheme 14

Scheme 15

1. E1 CHECK THE 4WD CONTROL MODULE VOLTAGE SUPPLY CIRCUITS FOR AN OPEN Key in OFF position. Disconnect: 4WD Control Module C281a Disconnect: 4WD Control Module C281b Key in ON position. Measure the voltage between the 4WD control module, harness side and ground as follows: Connector-Pin Circuit C281b-7 CBP18 (GY/OG) C281b-8 SBB26 (RD/BK) C281b-17 SBB23 (RD/WH) Are the voltages greater than 10 volts? YES : Go to E2 . NO : VERIFY the battery junction box (BJB) fuse 23 (20A) or fuse 26 (20A) is OK and the smart junction box (SJB) fuse 18 (10A) is OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. E2 CHECK THE 4WD CONTROL MODULE GROUND CIRCUITS FOR AN OPEN Key in OFF position. Measure the resistance between the 4WD control module, harness side and ground as follows: Connector-Pin Circuit C281a-1 GD138 (BK/WH) C281a-10 GD145 (BK/BU) Are the resistances less than 5 ohms? YES : Go to E3 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. E3 CHECK THE HIGH SPEED CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE 4WD CONTROL MODULE FOR AN OPEN Measure the resistance between the 4WD control module C281b-2, circuit VDB04 (BU/BK), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the 4WD control module C281b-1, circuit VDB05 (GN/BK), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to E4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. E4 CHECK FOR CORRECT 4WD CONTROL MODULE OPERATION Disconnect all the 4WD control module connectors. Check for: corrosion damaged pins pushed-out pins Connect all the 4WD control module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a 4WD control module. REFER to «FOUR WHEEL DRIVE (4WD) SYSTEMS»(ref-270895) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test F: The Occupant Classification Sensor Module Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS , Supplemental Restraint System for schematic and connector information.

Scheme 16

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Scheme 19

1. F1 CHECK THE OCCUPANT CLASSIFICATION SENSOR MODULE VOLTAGE SUPPLY CIRCUIT CBP17 (BN/GN) FOR AN OPEN WARNING: The safety belt pretensioner is a pyrotechnic device. Always wear safety glasses when repairing an air bag equipped vehicle and when handling a safety belt buckle pretensioner or safety belt retractor pretensioner. Never probe a pretensioner electrical connector. Doing so could result in pretensioner or air bag deployment and could result in personal injury. NOTE: The supplemental restraint system (SRS) must be fully operational and free of faults before releasing the vehicle to the customer. NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Key in OFF position. Depower the SRS. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . Disconnect: Occupant Classification Sensor Module C3159 Deactivate the SRS. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . Repower the SRS. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . Key in ON position. Measure the voltage between occupant classification sensor module C3159-1, circuit CBP17 (BN/GN), harness side and ground. Is the voltage greater than 10 volts? YES : Go to F2 . NO : VERIFY the smart junction box (SJB) fuse 17 (10A) is OK. If OK, REPAIR the circuit. REACTIVATE the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . CLEAR the DTCs. REPEAT the network test with the scan tool.
2. F2 CHECK THE OCCUPANT CLASSIFICATION SENSOR MODULE GROUND CIRCUIT GD145 (BK/BU) FOR AN OPEN Key in OFF position. Measure the resistance between occupant classification sensor module C3159-14, circuit GD145 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? YES : Go to F3 . NO : REPAIR the circuit. REACTIVATE the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . CLEAR the DTCs. REPEAT the network test with the scan tool.
3. F3 CHECK THE HS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE OCCUPANT CLASSIFICATION SENSOR MODULE FOR AN OPEN Measure the resistance between the occupant classification sensor module C3159-18, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the occupant classification sensor module C3159-9, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to F4 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. F4 CHECK FOR CORRECT OCCUPANT CLASSIFICATION SENSOR MODULE OPERATION Disconnect the occupant classification sensor module connector. Check for: corrosion damaged pins pushed-out pins Connect the occupant classification sensor module connector and make sure it seats correctly. Verify the concern is still present. Is the concern still present? YES : INSTALL a new occupant classification sensor module. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. REPOWER the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test G: The Instrument Cluster Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS , Instrument Cluster for schematic and connector information.

Scheme 20

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Scheme 22

1. G1 CHECK THE HS-CAN TERMINATION RESISTANCE Key in OFF position. NOTE: Failure to disconnect the battery will result in false resistance readings. Disconnect the battery ground cable. Disconnect the scan tool cable from the data link connector (DLC). Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance between 54 and 66 ohms? YES : Go to G2 . NO : Go to G4 .
2. G2 CHECK THE INSTRUMENT CLUSTER VOLTAGE SUPPLY CIRCUITS FOR AN OPEN Disconnect: Instrument Cluster C220 Connect the battery ground cable. Key in ON position. Measure the voltage between the instrument cluster, harness side and ground as follows: Instrument Cluster Connector-Pin Circuit C220-1 SBP24 (VT/RD) C220-2 CDC34 (WH/OG) Are the voltages greater than 10 volts? YES : Go to G3 . NO : VERIFY the smart junction box (SJB) fuse 8 (15A) or fuse 24 (10A) is OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. G3 CHECK THE INSTRUMENT CLUSTER GROUND CIRCUIT GD145 (BK/BU) FOR AN OPEN Key in OFF position. Measure the resistance between the instrument cluster C220-13, circuit GD145 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? YES : Go to G5 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. G4 CHECK THE HS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE INSTRUMENT CLUSTER FOR AN OPEN Measure the resistance between the instrument cluster C220-7, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the instrument cluster C220-8, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to G5 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
5. G5 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION Disconnect the instrument cluster connector. Check for: corrosion damaged pins pushed-out pins Connect the instrument cluster connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new instrument cluster. REFER to «INSTRUMENT CLUSTER»(ref-270940) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test H: The Smart Junction Box (SJB) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS , Grounds for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS SYSTEM WIRING DIAGRAMS , Power Distribution/SJB for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.

Scheme 23

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Scheme 27

1. H1 CHECK THE SJB FUSE FOR VOLTAGE Key in OFF position. NOTE: Measurements are taken with the fuses installed. Measure the voltage between the SJB fuse 2 (5A) and ground. Is the voltage greater than 10 volts? YES : Go to H3 . NO : VERIFY the smart junction box (SJB) fuse 2 (5A) is OK. If OK, go to H2 .
2. H2 CHECK THE SJB VOLTAGE SUPPLY CIRCUIT SBB03 (BU/RD) FOR AN OPEN Disconnect: SJB C2280e Measure the voltage between the SJB C2280e-1, circuit SBB03 (BU/RD), harness side and ground. Is the voltage greater than 10 volts? YES : Go to H5 . NO : VERIFY the battery junction box (BJB) fuse 3 (50A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. H3 CHECK THE SJB GROUND CIRCUIT GD108 (BK/VT) FOR AN OPEN Disconnect: SJB C2280e Measure the resistance between the SJB C2280e-22, circuit GD108 (BK/VT), harness side and ground. Is the resistance less than 5 ohms? YES : Go to H4 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. H4 CHECK THE MEDIUM SPEED CAN CIRCUITS BETWEEN THE DLC AND THE SJB FOR AN OPEN Disconnect: SJB C2280d Measure the resistance between the SJB C2280d-16, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the SJB C2280d-15, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to H5 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
5. H5 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion damaged pins pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-270935) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test I: The Electronic Automatic Temperature Control (EATC) Module Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS , Automatic Climate Control System for schematic and connector information.

Scheme 28

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Scheme 31

1. I1 CHECK THE EATC VOLTAGE SUPPLY CIRCUITS FOR AN OPEN Key in OFF position. Disconnect: EATC Module C228a Key in ON position. Measure the voltage between the EATC module C228a-13, circuit SBP28 (GN/RD), and between the EATC module C228a-3, circuit CBP20 (YE/VT) and ground. Are the voltages greater than 10 volts? YES : Go to I2 . NO : VERIFY smart junction box (SJB) fuse 20 (10A) or fuse 28 (10A) is OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. I2 CHECK THE EATC GROUND CIRCUIT GD145 (BK/BU) FOR AN OPEN Key in OFF position. Measure the resistance between the EATC module C228a-2, circuit GD145 (BK/BU) and ground. Is the resistance less than 5 ohms? YES : Go to I3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. I3 CHECK THE MEDIUM SPEED CAN CIRCUITS BETWEEN THE DLC AND THE EATC MODULE FOR AN OPEN Measure the resistance between the EATC module C228a-11, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the EATC module C228a-1, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to I4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. I4 CHECK FOR CORRECT EATC MODULE OPERATION Disconnect all the EATC module connectors. Check for: corrosion damaged pins pushed-out pins Connect all the EATC module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new EATC module. REFER to «CLIMATE CONTROL»(ref-270907) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test J: The Audio Unit Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS , Audio System/Navigation for schematic and connector information.

Circuits VDB06 (GY/OG) (MS-CAN +) and VDB07 (VT/OG) (MS-CAN -) provide the network connection to the audio unit. The audio unit shares the MS-CAN network with the instrument cluster, the smart junction box (SJB), the electronic automatic temperature control (EATC) module (if equipped), the satellite radio receiver (if equipped), the digital versatile disc (DVD) player, the driver seat module (DSM) (if equipped), the power running board module (if equipped) and the parking aid module (if equipped). Voltage for the audio unit is provided by circuits CBP12 (GN/WH) and SBP03 (BU/RD). Circuit GD114 (BK/BU) provides ground.

Possible Causes

1. Fuse
2. Circuit CBP12 (GN/WH) open
3. Circuit GD114 (BK/BU) open
4. Circuit SBP03 (BU/RD) open
5. Circuit VDB06 (GY/OG) open (MS-CAN +)
6. Circuit VDB07 (VT/OG) open (MS-CAN -)
7. Audio unit

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1. J1 CHECK THE AUDIO UNIT VOLTAGE SUPPLY CIRCUITS FOR AN OPEN Key in OFF position. Disconnect: Audio Unit C290a Key in ON position. Measure the voltage between the audio unit C290a-1, circuit SBP03 (BU/RD), harness side and ground; and between the audio unit C290a-2, circuit CBP12 (GN/WH), harness side and ground. Are the voltages greater than 10 volts? YES : Go to J2 . NO : VERIFY the smart junction box (SJB) fuse 3 (20A) or fuse 12 (5A) is OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. J2 CHECK THE AUDIO UNIT GROUND CIRCUIT GD114 (BK/BU) FOR AN OPEN Key in OFF position. Measure the resistance between the audio unit C290a-13, circuit GD114 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? YES : Go to J3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. J3 CHECK THE MS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE AUDIO UNIT FOR AN OPEN Measure the resistance between the audio unit C290b-15, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the base audio unit C290b-16, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to J4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. J4 CHECK FOR CORRECT AUDIO UNIT OPERATION Disconnect all the audio unit connectors. Check for: corrosion damaged pins pushed-out pins Connect all the audio unit connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new audio unit. REFER to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-270932) . TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test K: The Satellite Radio Receiver Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS , Audio System/Navigation for schematic and connector information.

Scheme 36

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1. K1 CHECK THE SATELLITE RADIO RECEIVER VOLTAGE SUPPLY CIRCUIT SBB41 (RD) FOR AN OPEN Key in OFF position. Disconnect: Satellite Radio Receiver C3290 Key in ON position. Measure the voltage between the satellite radio receiver C3290-9, circuit SBB41 (RD), harness side and ground. Is the voltage greater than 10 volts? YES : Go to K2 . NO : VERIFY the battery junction box (BJB) fuse 41 (15A) is OK. If OK, REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. K2 CHECK THE SATELLITE RADIO RECEIVER GROUND CIRCUIT GD114 (BK/BU) FOR AN OPEN Measure the resistance between the satellite radio receiver C3290-3, circuit GD114 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? YES : Go to K3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. K3 CHECK THE MS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE SATELLITE RADIO RECEIVER FOR AN OPEN Measure the resistance between the satellite radio receiver C3290-1, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the satellite radio receiver C3290-7, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to K4 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. K4 CHECK FOR CORRECT SATELLITE RADIO RECEIVER OPERATION Disconnect the satellite radio receiver connector. Check for: corrosion damaged pins pushed-out pins Connect the satellite radio receiver connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new satellite radio receiver. REFER to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-270932) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test L: The Digital Versatile Disc (DVD) Player Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS , Audio System/Navigation for schematic and connector information.

Scheme 40

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1. L1 CHECK THE DVD PLAYER VOLTAGE SUPPLY CIRCUIT SBB41 (RD) FOR AN OPEN Key in OFF position. Disconnect: DVD Player C949 Key in ON position. Measure the voltage between the DVD player C949-16, circuit SBB41 (RD), harness side and ground. Is the voltage greater than 10 volts? YES : Go to L2 . NO : VERIFY the battery junction box (BJB) fuse 41 (15A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. L2 CHECK THE DVD PLAYER GROUND CIRCUIT GD114 (BK/BU) FOR AN OPEN Measure the resistance between the DVD player C949-1, circuit GD114 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? YES : Go to L3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. L3 CHECK THE MS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE DVD PLAYER FOR AN OPEN Measure the resistance between the DVD player C949-8, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the DVD player C949-7, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to L4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. L4 CHECK FOR CORRECT DVD PLAYER OPERATION Disconnect the DVD player connector. Check for: corrosion damaged pins pushed-out pins Connect the DVD player connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new DVD player. REFER to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-270932) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test M: The Driver Seat Module (DSM) Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS , Memory Seats for schematic and connector information.

Scheme 44

Scheme 45

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Scheme 47

1. M1 CHECK THE DSM VOLTAGE SUPPLY CIRCUIT SBP01 (RD) FOR AN OPEN Key in OFF position. Disconnect: DSM C341c Key in ON position. Measure the voltage between the DSM C341c-1, circuit SBP01 (RD), harness side and ground. Is the voltage greater than 10 volts? YES : Go to M2 . NO : VERIFY smart junction box (SJB) fuse 1 (20A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. M2 CHECK THE DSM GROUND CIRCUIT GD143 (BK/OG) FOR AN OPEN Measure the resistance between the DSM C341c-13, circuit GD143 (BK/OG), harness side and ground. Is the resistance less than 5 ohms? YES : Go to M3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. M3 CHECK THE MEDIUM SPEED CAN CIRCUITS BETWEEN THE DLC AND THE DSM FOR AN OPEN Measure the resistance between the DSM C341c-11, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the DSM C341c-12, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to M4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. M4 CHECK FOR CORRECT DSM OPERATION Disconnect all the DSM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the DSM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new DSM. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-270935) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test N: The Power Running Board Module Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.

Scheme 48

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Scheme 51

1. N1 CHECK THE POWER RUNNING BOARD MODULE VOLTAGE SUPPLY CIRCUIT SBB19 (BU/RD) FOR AN OPEN Key in OFF position. Disconnect: Power Running Board Module C4322b Key in ON position. Measure the voltage between the power running board module C4322b-1, circuit SBB19 (BU/RD), harness side and ground. Is the voltage greater than 10 volts? YES : Go to N2 . NO : VERIFY the battery junction box (BJB) fuse 19 (30A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. N2 CHECK THE POWER RUNNING BOARD MODULE GROUND CIRCUIT GD151 (BK/GN) FOR AN OPEN Key in OFF position. Measure the resistance between the power running board module C4322b-4, circuit GD151 (BK/GN), harness side and ground. Is the resistance less than 5 ohms? YES : Go to N3 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. N3 CHECK THE MS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE POWER RUNNING BOARD MODULE FOR AN OPEN Measure the resistance between the power running board module C4322b-8, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the power running board module C4322b-7, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to N4 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. N4 CHECK FOR CORRECT POWER RUNNING BOARD MODULE OPERATION Disconnect all the power running board module connectors. Check for: corrosion damaged pins pushed-out pins Connect all the power running board module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new power running board module. REFER to «EXTERIOR TRIM AND ORNAMENTATION»(ref-270930) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test O: The Parking Aid Module Does Not Respond To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.

Refer to SYSTEM WIRING DIAGRAMS , Parking Aid for schematic and connector information.

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1. O1 VERIFY PARKING AID SYSTEM TYPE NOTE: The Explorer uses a radar parking aid system while the Mountaineer and Explorer Sport Trac use an ultrasonic system. Verify the parking aid system. Is the vehicle equipped with a RADAR parking aid system? YES : Go to O2 . NO : Go to O5 .
2. O2 CHECK THE PARKING AID MODULE VOLTAGE SUPPLY CIRCUIT CBP18 (GY/OG) FOR AN OPEN (RADAR) Key in OFF position. Disconnect: Parking Aid Module C4414 Key in ON position. Measure the voltage between the parking aid module C4414-18, circuit CBP18 (GY/OG), harness side and ground. Is the voltage greater than 10 volts? YES : Go to O3 . NO : VERIFY the smart junction box (SJB) fuse 18 (10A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
3. O3 CHECK THE PARKING AID MODULE GROUND CIRCUIT GD145 (BK/BU) FOR AN OPEN (RADAR) Key in OFF position. Measure the resistance between the parking aid module C4414-6, circuit GD145 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? YES : Go to O4 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
4. O4 CHECK THE MS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE PARKING AID MODULE FOR AN OPEN (RADAR) Measure the resistance between the parking aid module C4414-4, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the parking aid module C4414-5, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to O8 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
5. O5 CHECK THE PARKING AID MODULE VOLTAGE SUPPLY CIRCUIT CBP18 (GY/OG) FOR AN OPEN (ULTRASONIC) Key in OFF position. Disconnect: Parking Aid Module C4014 Key in ON position. Measure the voltage between the parking aid module C4014-1, circuit CBP18 (GY/OG), harness side and ground. Is the voltage greater than 10 volts? YES : Go to O6 . NO : VERIFY the smart junction box (SJB) fuse 18 (10A) is OK. If OK, REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
6. O6 CHECK THE PARKING AID MODULE GROUND CIRCUIT GD145 (BK/BU) FOR AN OPEN (ULTRASONIC) Key in OFF position. Measure the resistance between the parking aid module C4014-4, circuit GD145 (BK/BU), harness side and ground. Is the resistance less than 5 ohms? YES : Go to O7 . NO : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool.
7. O7 CHECK THE MS-CAN CIRCUITS BETWEEN THE DATA LINK CONNECTOR (DLC) AND THE PARKING AID MODULE FOR AN OPEN (ULTRASONIC) Measure the resistance between the parking aid module C4014-3, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the parking aid module C4014-11, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : Go to O8 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
8. O8 CHECK FOR CORRECT PARKING AID MODULE OPERATION Disconnect the parking aid module connector. Check for: corrosion damaged pins pushed-out pins Connect the parking aid module connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new parking aid module. REFER to «PARKING AID»(ref-270967) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test P: No Medium Speed Controller Area Network (MS-CAN) Communication, All Modules Are Not Responding

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.

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1. P1 CHECK THE DATA LINK CONNECTOR (DLC) PINS FOR DAMAGE NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Key in OFF position. Disconnect the scan tool cable from the DLC. Inspect DLC pins 3 and 11 for damage. Are DLC pins 3 and 11 OK? YES : Go to P2 . NO : REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. P2 CHECK THE MS-CAN TERMINATION RESISTANCE Key in OFF position. NOTE: Failure to disconnect the battery will result in false resistance readings. Disconnect the battery ground cable. Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance between 54 and 66 ohms? YES : Go to P5 . NO : Go to P3 .
3. P3 CHECK THE MS-CAN TERMINATION RESISTOR Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance between 108 and 132 ohms? YES : Go to P7 . NO : Go to P4 .
4. P4 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : Go to P8 . NO : Go to P7 .
5. P5 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 5,000 ohms? YES : Go to P6 . NO : Go to P23 .
6. P6 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE Connect the battery ground cable. Key in ON position. Measure the voltage between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Is the voltage greater than 6 volts? YES : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The MS-CAN has tested within specifications. VERIFY all module fuses are OK. If OK, REPEAT the network test with the scan tool to verify network functionality.
7. P7 CHECK THE MS-CAN CIRCUITS BETWEEN THE DLC AND THE SJB FOR AN OPEN Disconnect: SJB C2280d Measure the resistance between the SJB C2280d-16, circuit VDB06 (GY/OG), harness side and the DLC C251-3, circuit VDB06 (GY/OG), harness side. Measure the resistance between the SJB C2280d-15, circuit VDB07 (VT/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Are the resistances less than 5 ohms? YES : VERIFY all module fuses are OK. If OK, CONNECT all modules. CONNECT the battery ground cable. REPEAT the network test with the scan tool. NO : REPAIR the circuit in question. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
8. P8 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE SJB DISCONNECTED Disconnect: SJB C2280d Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : Go to P9 . NO : Go to P38 .
9. P9 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE INSTRUMENT CLUSTER DISCONNECTED Disconnect: Instrument Cluster C220 Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : Go to P10 . NO : Go to P39 .
10. P10 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE AUDIO UNIT DISCONNECTED Disconnect: Audio Unit C290b Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : Go to P11 . NO : Go to P40 .
11. P11 VERIFY VEHICLE EQUIPMENT - EATC MODULE Inspect the vehicle for EATC. Is the vehicle equipped with EATC? YES : Go to P12 . NO : Go to P13 .
12. P12 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE EATC MODULE DISCONNECTED Disconnect: EATC Module C228a Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : Go to P13 . NO : Go to P41 .
13. P13 VERIFY VEHICLE EQUIPMENT - DVD PLAYER Inspect the vehicle for a DVD player. Is the vehicle equipped with a DVD player? YES : Go to P14 . NO : Go to P15 .
14. P14 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE DVD PLAYER DISCONNECTED Disconnect: DVD Player C949 Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : Go to P15 . NO : Go to P42 .
15. P15 VERIFY VEHICLE EQUIPMENT - DRIVER SEAT MODULE Inspect the vehicle for a driver seat module. Is the vehicle equipped with a driver seat module? YES : Go to P16 . NO : Go to P17 .
16. P16 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE DRIVER SEAT MODULE DISCONNECTED Disconnect: Driver Seat Module C341c Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : Go to P17 . NO : Go to P43 .
17. P17 VERIFY VEHICLE EQUIPMENT - SATELLITE RADIO RECEIVER Inspect the vehicle for a satellite radio receiver. Is the vehicle equipped with a satellite radio receiver? YES : Go to P18 . NO : Go to P19 .
18. P18 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE SATELLITE RADIO RECEIVER DISCONNECTED Disconnect: Satellite Radio Receiver C3290 Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : Go to P19 . NO : Go to P44 .
19. P19 VERIFY VEHICLE EQUIPMENT - POWER RUNNING BOARD MODULE Inspect the vehicle for a power running board module. Is the vehicle equipped with a power running board module? YES : Go to P20 . NO : Go to P21 .
20. P20 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE POWER RUNNING BOARD MODULE DISCONNECTED Disconnect: Power Running Board Module C4322b Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : Go to P21 . NO : Go to P45 .
21. P21 VERIFY VEHICLE EQUIPMENT - PARKING AID MODULE Inspect the vehicle for a parking aid module. Is the vehicle equipped with a parking aid module? YES : Go to P22 . NO : REPAIR the circuit. CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
22. P22 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE PARKING AID MODULE DISCONNECTED Disconnect: Parking Aid Module C4014 Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and the DLC C251-11, circuit VDB07 (VT/OG), harness side. Is the resistance less than 5 ohms? YES : REPAIR the circuit. CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : Go to P46 .
23. P23 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE SJB DISCONNECTED Disconnect: SJB C2280d Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 5,000 ohms? YES : Go to P38 . NO : Go to P24 .
24. P24 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE INSTRUMENT CLUSTER DISCONNECTED Disconnect: Instrument Cluster C220 Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 5,000 ohms? YES : Go to P39 . NO : Go to P25 .
25. P25 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE AUDIO UNIT DISCONNECTED Disconnect: Audio Unit C290b Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 5,000 ohms? YES : Go to P40 . NO : Go to P26 .
26. P26 VERIFY VEHICLE EQUIPMENT - EATC MODULE Inspect the vehicle for an EATC module. Is the vehicle equipped with an EATC module? YES : Go to P27 . NO : Go to P28 .
27. P27 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE EATC MODULE DISCONNECTED Disconnect: EATC Module C228a Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 5,000 ohms? YES : Go to P41 . NO : Go to P28 .
28. P28 VERIFY VEHICLE EQUIPMENT - DVD PLAYER Inspect the vehicle for a DVD player. Is the vehicle equipped with a DVD player? YES : Go to P29 . NO : Go to P30 .
29. P29 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE DVD PLAYER DISCONNECTED Disconnect: DVD Player C949 Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 5,000 ohms? YES : Go to P42 . NO : Go to P30 .
30. P30 VERIFY VEHICLE EQUIPMENT - DRIVER SEAT MODULE Inspect the vehicle for a driver seat module. Is the vehicle equipped with a driver seat module? YES : Go to P31 . NO : Go to P32 .
31. P31 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE DRIVER SEAT MODULE DISCONNECTED Disconnect: Driver Seat Module C341c Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 5,000 ohms? YES : Go to P43 . NO : Go to P32 .
32. P32 VERIFY VEHICLE EQUIPMENT - SATELLITE RADIO RECEIVER Inspect the vehicle for a satellite radio receiver. Is the vehicle equipped with a satellite radio receiver? YES : Go to P33 . NO : Go to P34 .
33. P33 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE SATELLITE RADIO RECEIVER DISCONNECTED Disconnect: Satellite Radio Receiver C3290 Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 5,000 ohms? YES : Go to P44 . NO : Go to P34 .
34. P34 VERIFY VEHICLE EQUIPMENT - POWER RUNNING BOARD MODULE Inspect the vehicle for a power running board module. Is the vehicle equipped with a power running board module? YES : Go to P35 . NO : Go to P36 .
35. P35 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE POWER RUNNING BOARD MODULE DISCONNECTED Disconnect: Power Running Board Module C4322b Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 5,000 ohms? YES : Go to P45 . NO : Go to P36 .
36. P36 VERIFY VEHICLE EQUIPMENT - PARKING AID MODULE Inspect the vehicle for a parking aid module. Is the vehicle equipped with a parking aid module? YES : Go to P37 . NO : REPAIR the circuit. CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
37. P37 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE PARKING AID MODULE DISCONNECTED Disconnect: Parking Aid Module C4014 Measure the resistance between the DLC C251-3, circuit VDB06 (GY/OG), harness side and ground; and between the DLC C251-11, circuit VDB07 (VT/OG), harness side and ground. Are the resistances greater than 5,000 ohms? YES : Go to P46 . NO : REPAIR the circuit. CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
38. P38 CHECK FOR CORRECT SJB OPERATION Disconnect all the SJB connectors. Check for: corrosion damaged pins pushed-out pins Connect all the SJB connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new SJB. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-270935) . CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
39. P39 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION Disconnect the instrument cluster connector. Check for: corrosion damaged pins pushed-out pins Connect the instrument cluster connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new instrument cluster. REFER to «INSTRUMENT CLUSTER»(ref-270940) . CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
40. P40 CHECK FOR CORRECT AUDIO UNIT OPERATION Disconnect all the audio unit connectors. Check for: corrosion damaged pins pushed-out pins Connect all the audio unit connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new audio unit. REFER to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-270932) . CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
41. P41 CHECK FOR CORRECT EATC MODULE OPERATION Disconnect all the EATC module connectors. Check for: corrosion damaged pins pushed-out pins Connect all the EATC module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new EATC module. REFER to «CLIMATE CONTROL»(ref-270907) . CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
42. P42 CHECK FOR CORRECT DVD PLAYER OPERATION Disconnect the DVD player connector. Check for: corrosion damaged pins pushed-out pins Connect the DVD player connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new DVD player. REFER to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-270932) . TEST the system for normal operation. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.
43. P43 CHECK FOR CORRECT DSM OPERATION Disconnect all the DSM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the DSM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new DSM. REFER to «MULTIFUNCTION ELECTRONIC MODULES»(ref-270935) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.
44. P44 CHECK FOR CORRECT SATELLITE RADIO RECEIVER OPERATION Disconnect the satellite radio receiver connector. Check for: corrosion damaged pins pushed-out pins Connect the satellite radio receiver connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new satellite radio receiver. REFER to «INFORMATION AND ENTERTAINMENT SYSTEMS»(ref-270932) . CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
45. P45 CHECK FOR CORRECT POWER RUNNING BOARD MODULE OPERATION Disconnect all the power running board module connectors. Check for: corrosion damaged pins pushed-out pins Connect all the power running board module connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new power running board module. REFER to «EXTERIOR TRIM AND ORNAMENTATION»(ref-270930) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.
46. P46 CHECK FOR CORRECT PARKING AID MODULE OPERATION Disconnect the parking aid module connector. Check for: corrosion damaged pins pushed-out pins Connect the parking aid module connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new parking aid module. REFER to «PARKING AID»(ref-270967) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test Q: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.

Scheme 64

1. Q1 CHECK THE DATA LINK CONNECTOR (DLC) PINS FOR DAMAGE NOTE: Most faults are due to connector and/or wiring concerns. Carry out a thorough inspection and verification before proceeding with the pinpoint test. Key in OFF position. Disconnect the scan tool cable from the DLC. Inspect DLC pins 6 and 14 for damage. Are DLC pins 6 and 14 OK? YES : Go to Q2 . NO : REPAIR the DLC as necessary. CLEAR the DTCs. REPEAT the network test with the scan tool.
2. Q2 CHECK THE HS-CAN TERMINATION RESISTANCE Key in OFF position. NOTE: Failure to disconnect the battery will result in false resistance readings. Disconnect the battery ground cable. Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance between 54 and 66 ohms? YES : Go to Q3 . NO : Go to Q5 .
3. Q3 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 5,000 ohms? YES : Go to Q4 . NO : Go to Q20 .
4. Q4 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO VOLTAGE Connect the battery ground cable. Key in ON position. Measure the voltage between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Is the voltage greater than 6 volts? YES : REPAIR the circuit. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The CAN network has tested within specifications. VERIFY the scan tool operation on a substitute vehicle and REPEAT the network test on the suspect vehicle.
5. Q5 CHECK THE HS-CAN TERMINATION RESISTOR Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance between 108 and 132 ohms? YES : Go to Q6 . NO : Go to Q9 .
6. Q6 CHECK THE HS-CAN TERMINATION RESISTOR WITH THE PCM DISCONNECTED Disconnect: PCM C175b Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance between 108 and 132 ohms? YES : Go to Q7 . NO : Go to Q8 .
7. Q7 CHECK THE CAN CIRCUITS BETWEEN THE DLC AND THE PCM FOR AN OPEN Measure the resistance between the PCM C175b-11, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the PCM C175b-23, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to Q29 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
8. Q8 CHECK THE HS-CAN CIRCUITS BETWEEN THE DLC AND THE INSTRUMENT CLUSTER FOR AN OPEN Measure the resistance between the instrument cluster C220-7, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the instrument cluster C220-8, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : Go to Q33 . NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
9. Q9 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? YES : Go to Q11 . NO : Go to Q10 .
10. Q10 CHECK THE HS-CAN CIRCUITS BETWEEN THE DLC AND THE PCM FOR AN OPEN Measure the resistance between the PCM C175b-11, circuit VDB04 (WH/BU), harness side and the DLC C251-6, circuit VDB04 (WH/BU), harness side. Measure the resistance between the PCM C175b-23, circuit VDB05 (WH), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances less than 5 ohms? YES : The CAN network has tested within specifications. VERIFY the scan tool operation on a substitute vehicle, and REPEAT the network test on the suspect vehicle. NO : REPAIR the circuit in question. CLEAR the DTCs. REPEAT the network test with the scan tool.
11. Q11 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE PCM DISCONNECTED Disconnect: PCM C175b Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? YES : Go to Q12 . NO : Go to Q29 .
12. Q12 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE ABS MODULE DISCONNECTED Disconnect: ABS Module C155 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? YES : Go to Q13 . NO : Go to Q30 .
13. Q13 VERIFY VEHICLE EQUIPMENT - 6R60 TRANSMISSION MODULE Inspect the vehicle for a 6R60 transmission. Is the vehicle equipped with a 6R60 transmission? YES : Go to Q14 . NO : Go to Q15 .
14. Q14 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE TCM DISCONNECTED Disconnect: TCM C199 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? YES : Go to Q15 . NO : Go to Q31 .
15. Q15 VERIFY VEHICLE EQUIPMENT - 4WD CONTROL MODULE Inspect the vehicle for 4WD. Is the vehicle equipped with 4WD? YES : Go to Q16 . NO : Go to Q17 .
16. Q16 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE 4WD CONTROL MODULE DISCONNECTED Disconnect: 4WD Control Module C281b Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? YES : Go to Q17 . NO : Go to Q32 .
17. Q17 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE INSTRUMENT CLUSTER DISCONNECTED Disconnect: Instrument Cluster C220 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? YES : Go to Q18 . NO : Go to Q33 .
18. Q18 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE RCM DISCONNECTED Depower the supplemental restraint system (SRS). Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . Disconnect: RCM C310b Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? YES : Go to Q19 . NO : Go to Q34 .
19. Q19 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TOGETHER WITH THE OCCUPANT CLASSIFICATION SYSTEM MODULE DISCONNECTED Disconnect: Occupant Classification Sensor Module C3159 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Is the resistance less than 5 ohms? YES : REPAIR the circuit. CONNECT all modules. REPOWER the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : Go to Q35 .
20. Q20 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE PCM DISCONNECTED Disconnect: PCM C175b Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 5,000 ohms? YES : Go to Q29 . NO : Go to Q21 .
21. Q21 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE ABS MODULE DISCONNECTED Disconnect: ABS Module C155 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 5,000 ohms? YES : Go to Q30 . NO : Go to Q22 .
22. Q22 VERIFY VEHICLE EQUIPMENT - 6R60 TRANSMISSION Inspect the vehicle for a 6R60 transmission. Is the vehicle equipped with a 6R60 transmission? YES : Go to Q23 . NO : Go to Q24 .
23. Q23 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE TCM DISCONNECTED Disconnect: TCM C199 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances greater than 5,000 ohms? YES : Go to Q31 . NO : Go to Q24 .
24. Q24 VERIFY VEHICLE EQUIPMENT - 4WD MODULE Inspect the vehicle for 4WD. Is the vehicle equipped with 4WD? YES : Go to Q25 . NO : Go to Q26 .
25. Q25 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE 4WD CONTROL MODULE DISCONNECTED Disconnect: 4WD Control Module C281b Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and the DLC C251-14, circuit VDB05 (WH), harness side. Are the resistances greater than 5,000 ohms? YES : Go to Q32 . NO : Go to Q26 .
26. Q26 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE INSTRUMENT CLUSTER DISCONNECTED Disconnect: Instrument Cluster C220 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 5,000 ohms? YES : Go to Q33 . NO : Go to Q27 .
27. Q27 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE RCM DISCONNECTED Depower the SRS. Refer to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . Disconnect: RCM C310b Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 5,000 ohms? YES : Go to Q34 . NO : Go to Q28 .
28. Q28 CHECK THE HS-CAN (+) AND HS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE OCCUPANT CLASSIFICATION SYSTEM MODULE DISCONNECTED Disconnect: Occupant Classification Sensor Module C3159 Measure the resistance between the DLC C251-6, circuit VDB04 (WH/BU), harness side and ground; and between the DLC C251-14, circuit VDB05 (WH), harness side and ground. Are the resistances greater than 5,000 ohms? YES : Go to Q35 . NO : REPAIR the circuit. CONNECT all modules. REPOWER the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . CLEAR the DTCs. REPEAT the network test with the scan tool.
29. Q29 CHECK FOR CORRECT PCM OPERATION Disconnect all the PCM connectors. Check for: corrosion damaged pins pushed-out pins Connect all the PCM connectors and make sure they seat correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new PCM. REFER to «ELECTRONIC ENGINE CONTROLS»(ref-270955) . CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
30. Q30 CHECK FOR CORRECT ABS MODULE OPERATION Disconnect the ABS module connector. Check for: corrosion damaged pins pushed-out pins Connect the ABS module connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new ABS module. REFER to «VEHICLE DYNAMIC SYSTEMS»(ref-270960) . CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
31. Q31 CHECK FOR CORRECT TCM OPERATION Disconnect the TCM connector. Check for: corrosion damaged pins pushed-out pins Connect the TCM connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new TCM. REFER to «AUTOMATIC TRANSAXLE/TRANSMISSION - 6R60»(ref-270910) , mechatronic assembly. CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
32. Q32 CHECK FOR CORRECT 4WD CONTROL MODULE OPERATION Disconnect the 4WD control module connector. Check for: corrosion damaged pins pushed-out pins Connect the 4WD control module connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new 4WD control module. REFER to «FOUR WHEEL DRIVE (4WD) SYSTEMS»(ref-270895) . CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
33. Q33 CHECK FOR CORRECT INSTRUMENT CLUSTER OPERATION Disconnect the instrument cluster connector. Check for: corrosion damaged pins pushed-out pins Connect the instrument cluster connector and make sure it seats correctly. Operate the system and verify the concern is still present. Is the concern still present? YES : INSTALL a new instrument cluster. REFER to «INSTRUMENT CLUSTER»(ref-270940) . CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.
34. Q34 CHECK FOR CORRECT RCM MODULE OPERATION Disconnect all the RCM module connectors. Check for: corrosion damaged pins pushed-out pins Connect all the RCM module connectors and make sure they seat correctly. Verify the concern is still present. Is the concern still present? YES : INSTALL a new RCM module. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. REPOWER the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . CLEAR the DTCs. REPEAT the network test with the scan tool.
35. Q35 CHECK FOR CORRECT OCCUPANT CLASSIFICATION SENSOR MODULE OPERATION Disconnect the occupant classification sensor module connector. Check for: corrosion damaged pins pushed-out pins Connect the occupant classification sensor module connector and make sure it seats correctly. Verify the concern is still present. Is the concern still present? YES : INSTALL a new occupant classification sensor module. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . CLEAR the DTCs. REPEAT the network test with the scan tool. NO : The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. REPOWER the SRS. REFER to «SUPPLEMENTAL RESTRAINT SYSTEM»(ref-270926) . CLEAR the DTCs. REPEAT the network test with the scan tool.

Pinpoint Test R: No Power To The Scan Tool

Refer to SYSTEM WIRING DIAGRAMS , Module Communications Network for schematic and connector information.