AH76-AH83

Communications Network

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

Refer to Wiring Diagram Set 14, Module Communications Network for schematic and connector information. Diagrams By Number

Normal Operation

The Medium Speed Controller Area Network (MS-CAN) uses an unshielded twisted pair cable.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Accessory Protocol Interface Module (APIM) (if equipped)
- Audio Control Module (ACM)
- Audio Digital Signal Processing (DSP) module (if equipped)
- Driver Door Module (DDM) (if equipped)
- Driver Seat Module (DSM) (if equipped)
- Dual Climate Controlled Seat Module (DCSM) (if equipped)
- Front Controls Interface Module (FCIM)
- Liftgate/Trunk Module (LTM)
- Passenger Climate Controlled Seat Module (PCSM) (part of the steering gear) (if equipped)
- Headlamp Control Module 2 (HCM-2) (if equipped)
- HVAC module (if equipped)
- Interior Lighting Control Module (ILCM) (if equipped)
- Instrument Panel Cluster (IPC) (gateway module)
- Rear Entertainment Module (RETM) (if equipped)

- Rear Heating Ventilation Air Conditioning (RHVAC) module (if equipped)
- Remote Function Actuator (RFA) module (if equipped)
- Smart Junction Box (SJB)
- Side Obstacle Detection Control Module - Left (SOD-L) (if equipped)
- Side Obstacle Detection Control Module - Right (SOD-R) (if equipped)

PINPOINT TEST AH: NO MS-CAN COMMUNICATION, ALL MODULES ARE NOT RESPONDING

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

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

NOTE: Failure to disconnect the battery when instructed will result in false resistance readings. Refer to Battery, Mounting and Cables Battery Disconnect.

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AH76 CHECK FOR CORRECT DCSM OPERATION

- Disconnect all the DCSM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the DCSM 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 DCSM. REFER to Seating Dual Climate Controlled Seat Module (DCSM). CONNECT all modules. 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. CLEAR the DTCs. REPEAT the network test with the scan tool.

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AH77 CHECK FOR CORRECT APIM OPERATION

- Disconnect the APIM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the APIM 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 APIM. REFER to Information and Entertainment Systems Accessory Protocol Interface Module (APIM). CONNECT all modules. 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. CLEAR the DTCs. REPEAT the network test with the scan tool.

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AH78 CHECK FOR CORRECT DDM OPERATION

- Disconnect all the DDM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the DDM 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 DDM. REFER to Handles, Locks, Latches and Entry Systems Service and Repair. CONNECT all modules. 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. CLEAR the DTCs. REPEAT the network test with the scan tool.

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AH79 CHECK FOR CORRECT HCM-2 OPERATION

- Disconnect the HCM-2 connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the HCM-2 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 HCM-2. REFER to Exterior Lighting Headlamp Control Module 2 (HCM-2). CONNECT all modules. CLEAR the DTCs. CONNECT all modules. 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. REPEAT the network test with the scan tool.

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AH80 CHECK FOR CORRECT RHVAC MODULE OPERATION

- Disconnect the RHVAC connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the RHVAC 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 RHVAC. REFER to Auxiliary Climate Control Rear Heating Ventilation Air Conditioning (RHVAC) Module.
CONNECT all modules. CLEAR the DTCs. CONNECT all modules. 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. REPEAT the network test with the scan tool.

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AH81 CHECK FOR CORRECT RETM OPERATION

- Disconnect all the RETM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the RETM 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 RETM. REFER to Information and Entertainment Systems Rear Entertainment Module (RETM). CONNECT all modules. CLEAR the DTCs. CONNECT all modules. 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. REPEAT the network test with the scan tool.

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AH82 CHECK FOR CORRECT SOD-L OPERATION

- Disconnect the SOD-L connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the SOD-L 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 SOD-L. REFER to Side And Rear Vision Service and Repair. CONNECT all modules. CLEAR the DTCs. CONNECT all modules. 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. REPEAT the network test with the scan tool.

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AH83 CHECK FOR CORRECT SOD-R OPERATION

- Disconnect the SOD-R connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the SOD-R 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 SOD-R. REFER to Side And Rear Vision Service and Repair. CONNECT all modules. 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. CLEAR the DTCs. REPEAT the network test with the scan tool.