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Diagnostic Routine AE




Diagnostic Routine AE

Diagnostic Overview

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

Refer to Wiring Diagram Set 14 for schematic and connector information Electrical Diagrams.

Normal Operation and Fault Conditions

REFER to Medium Speed Controller Area Network (MS-CAN)

REFER to Controller Area Network (CAN) Fault Tolerance

Pinpoint Test

1. CHECK THE DLC (Data Link Connector) PINS FOR DAMAGE

1. Ignition OFF.

2. Disconnect the scan tool cable from the DLC (Data Link Connector).

3. Inspect the DLC (Data Link Connector) pins 3 and 11 for damage.





Are DLC (Data Link Connector) pins 3 and 11 OK?






2. CHECK THE MS-CAN (Medium Speed Controller Area Network) TERMINATION RESISTANCE

1. Measure:





Is the resistance between 54 and 66 ohms?






3. CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO GROUND

1. Measure:





Are the resistances greater than 1,000 ohms?






4. CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO VOLTAGE

1. Ignition ON.

2. Measure:





Are the voltages greater than 6 volts?






5. CHECK THE MS-CAN (Medium Speed Controller Area Network) TERMINATION RESISTOR

1. Measure:





Is the resistance between 108 and 132 ohms?






6. CHECK THE MS-CAN (Medium Speed Controller Area Network) TERMINATION RESISTOR WITH THE BCM (Body Control Module) DISCONNECTED

1. Disconnect: BCM (Body Control Module) C2280B.

2. Measure:





Is the resistance between 108 and 132 ohms?






7. CHECK THE MS-CAN (Medium Speed Controller Area Network) CIRCUITS BETWEEN THE BCM (Body Control Module) AND THE DLC (Data Link Connector) FOR AN OPEN

1. Measure:





Are the resistances less than 3 ohms?






8. CHECK THE MS-CAN (Medium Speed Controller Area Network) CIRCUITS BETWEEN THE HVAC (Heating, Ventilation, and Air Conditioning) MODULE AND THE DLC (Data Link Connector) FOR AN OPEN

1. Disconnect: HVAC (Heating, Ventilation, and Air Conditioning) module C228A.

2. Measure:





Are the resistances less than 3 ohms?






9. CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER

1. Measure:





Is the resistance less than 3 ohms?






10. CHECK THE MS-CAN (Medium Speed Controller Area Network) CIRCUITS BETWEEN THE BCM (Body Control Module) AND THE DLC (Data Link Connector) FOR AN OPEN

1. Measure:





Is the resistance greater than 10,000 ohms?






11. CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TOGETHER

1. Measure:





2. Disconnect module one at a time until the resistance is greater than 5 ohms:

- APIM (Accessory Protocol Interface Module) (if equipped)
- BCM (Body Control Module) C2280B
- DSM (Driver Seat Module) C341D (if equipped)
- DCSM (Dual Climate Controlled Seat Module) C3265C (if equipped)
- GPSM (Global Positioning System Module) (if equipped)
- LTM (Liftgate/Trunk Module) C4174B (if equipped)
- SOD-L (Side Obstacle Detection Control Module - Left) (if equipped)
- SOD-R (Side Obstacle Detection Control Module - Right) (if equipped)
- TPM (Tire Pressure Monitor) module
- RFA (Remote Function Actuator) module C2153E (if equipped)
- HVAC (Heating, Ventilation, and Air Conditioning) module C228A

Did the resistance change to greater than 5 ohms with one of the modules disconnected?






12. CHECK THE MS-CAN (Medium Speed Controller Area Network) (+) AND MS-CAN (Medium Speed Controller Area Network) (-) CIRCUITS FOR A SHORT TO GROUND WITH THE MODULES DISCONNECTED

1. Measure





2. Disconnect a module one at a time until the resistance to ground is greater than 1,000 ohms:

- APIM (Accessory Protocol Interface Module) (if equipped)
- BCM (Body Control Module) C2280B
- DSM (Driver Seat Module) C341D (if equipped)
- DCSM (Dual Climate Controlled Seat Module) C3265C (if equipped)
- GPSM (Global Positioning System Module) (if equipped)
- LTM (Liftgate/Trunk Module) C4174B (if equipped)
- SOD-L (Side Obstacle Detection Control Module - Left) (if equipped)
- SOD-R (Side Obstacle Detection Control Module - Right) (if equipped)
- TPM (Tire Pressure Monitor) module
- RFA (Remote Function Actuator) module C2153E (if equipped)
- HVAC (Heating, Ventilation, and Air Conditioning) module C228A

Did the resistance change to greater than 1,000 ohms with one of the modules disconnected?






13. CHECK FOR RESTORED COMMUNICATION WITH THE BCM (Body Control Module), GPSM (Global Positioning System Module), TPM (Tire Pressure Monitor) MODULE, AND THE APIM (Accessory Protocol Interface Module) DISABLED
NOTE: When re-running the network test, close the network test application first or the screen display reverts back to the prior run network test results.

1. Disconnect modules one at a time until other MS-CAN (Medium Speed Controller Area Network) modules pass the network test. Skip to the end once network operation is restored.

2. Disconnect: BCM (Body Control Module) Fuse 18 (10A) to disable the BCM (Body Control Module).

3. Using a scan tool, perform network test.

4. Disconnect: BCM (Body Control Module) Fuse 26 (5A) to disable the TPM (Tire Pressure Monitor) module.

5. Repeat the network test.

6. Disconnect: BCM (Body Control Module) Fuse 29 (20A) to disable the GPSM (Global Positioning System Module) and APIM (Accessory Protocol Interface Module) (if equipped).

7. Repeat the network test.

Do all other MS-CAN (Medium Speed Controller Area Network) modules pass the network test?






14. CHECK FOR RESTORED COMMUNICATION WITH THE GPSM (Global Positioning System Module) AND THE APIM (Accessory Protocol Interface Module) DISCONNECTED
NOTE: When re-running the network test, close the network test application first or the screen display reverts back to the prior run network test results.

1. Disconnect: GPSM (Global Positioning System Module) (if equipped).

2. Using a scan tool, perform network test.

Do all other MS-CAN (Medium Speed Controller Area Network) modules pass the network test?






15. CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE SOD-L (Side Obstacle Detection Control Module - Left), SOD-R (Side Obstacle Detection Control Module - Right), HVAC (Heating, Ventilation, and Air Conditioning) MODULE, DCSM (Dual Climate Controlled Seat Module), AND THE LTM (Liftgate/Trunk Module) DISABLED
NOTE: When re-running the network test, close the network test application first or the screen display reverts back to the prior run network test results.

1. Disconnect: BJB (Battery Junction Box) Fuse 28 (30A) and BCM (Body Control Module) Fuse 46 (10A) to disable the HVAC (Heating, Ventilation, and Air Conditioning) module, DCSM (Dual Climate Controlled Seat Module).

2. Using a scan tool, perform network test.

3. Install the removed fuses.

4. Disconnect: BCM (Body Control Module) Fuses 9 (10A) to disable the LTM (Liftgate/Trunk Module) (if equipped).

5. Repeat the network test.

6. Install the removed fuse.

7. Disconnect: BCM (Body Control Module) Fuse 34 (10A) to disable the SOD-L (Side Obstacle Detection Control Module - Left) and SOD-R (Side Obstacle Detection Control Module - Right) (if equipped).

8. Repeat the network test.

Do all other MS-CAN (Medium Speed Controller Area Network) modules pass the network test?






16. CHECK FOR RESTORED COMMUNICATION WITH THE HVAC (Heating, Ventilation, and Air Conditioning) MODULE DISCONNECTED
NOTE: When re-running the network test, close the network test application first or the screen display reverts back to the prior run network test results.

1. Disconnect modules one at a time until other MS-CAN (Medium Speed Controller Area Network) modules pass the network test. Skip to the end once network operation is restored.

2. Disconnect: HVAC (Heating, Ventilation, and Air Conditioning) module C228A.

3. Using a scan tool, perform network test.

Do all other MS-CAN (Medium Speed Controller Area Network) modules pass the network test?






17. CHECK FOR RESTORED COMMUNICATION WITH THE SOD-L (Side Obstacle Detection Control Module - Left) DISCONNECTED
NOTE: When re-running the network test, close the network test application first or the screen display reverts back to the prior run network test results.

1. Disconnect: SOD-L (Side Obstacle Detection Control Module - Left) (if equipped).

2. Using a scan tool, perform network test.

Do all other MS-CAN (Medium Speed Controller Area Network) modules pass the network test?






18. CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE DSM (Driver Seat Module) AND RFA (Remote Function Actuator) MODULE DISABLED
NOTE: When re-running the network test, close the network test application first or the screen display reverts back to the prior run network test results.

1. Disable modules one at a time until other MS-CAN (Medium Speed Controller Area Network) modules pass the network test. Skip to the end once network operation is restored.

2. Disconnect: BCM (Body Control Module) Fuse 7 (7.5A) for the DSM (Driver Seat Module) (if equipped).

3. Using a scan tool, perform network test.

4. Install the removed fuse.

5. Disconnect: BCM (Body Control Module) Fuses 23 (15A) and 27 (20A) for the RFA (Remote Function Actuator) module (if equipped).

6. Using a scan tool, perform network test.

Do all other modules pass the network test?






19. CHECK THE APIM (Accessory Protocol Interface Module) FOR CORRECT OPERATION

1. Ignition OFF.

2. Disconnect and inspect the APIM (Accessory Protocol Interface Module) connector.

3. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary

4. Reconnect the APIM (Accessory Protocol Interface Module) connector. Make sure it seats and latches correctly.

5. Operate the system and determine the concern is still present.

Is the concern still present?






20. CHECK THE BCM (Body Control Module) FOR CORRECT OPERATION

1. Ignition OFF.

2. Disconnect and inspect the BCM (Body Control Module) connectors.

3. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary

4. Reconnect the BCM (Body Control Module) connectors. Make sure they seat and latch correctly.

5. Operate the system and determine the concern is still present.

Is the concern still present?






21. CHECK THE DSM (Driver Seat Module) FOR CORRECT OPERATION

1. Ignition OFF.

2. Disconnect and inspect the DSM (Driver Seat Module) connectors.

3. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary

4. Reconnect the DSM (Driver Seat Module) connectors. Make sure they seat and latch correctly.

5. Operate the system and determine the concern is still present.

Is the concern still present?






22. CHECK THE DCSM (Dual Climate Controlled Seat Module) FOR CORRECT OPERATION

1. Ignition OFF.

2. Disconnect and inspect the DCSM (Dual Climate Controlled Seat Module) connectors.

3. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary

4. Reconnect the DCSM (Dual Climate Controlled Seat Module) connectors. Make sure they seat and latch correctly.

5. Operate the system and determine the concern is still present.

Is the concern still present?






23. CHECK THE GPSM (Global Positioning System Module) FOR CORRECT OPERATION

1. Ignition OFF.

2. Disconnect and inspect the GPSM (Global Positioning System Module) connector.

3. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary

4. Reconnect the GPSM (Global Positioning System Module) connector. Make sure it seats and latches correctly.

5. Operate the system and determine the concern is still present.

Is the concern still present?






24. CHECK THE HVAC (Heating, Ventilation, and Air Conditioning) MODULE FOR CORRECT OPERATION

1. Ignition OFF.

2. Disconnect and inspect the HVAC (Heating, Ventilation, and Air Conditioning) module connectors.

3. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary

4. Reconnect the HVAC (Heating, Ventilation, and Air Conditioning) module connectors. Make sure they seat and latch correctly.

5. Operate the system and determine the concern is still present.

Is the concern still present?






25. CHECK THE LTM (Liftgate/Trunk Module) FOR CORRECT OPERATION

1. Ignition OFF.

2. Disconnect and inspect the LTM (Liftgate/Trunk Module) connectors.

3. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary

4. Reconnect the LTM (Liftgate/Trunk Module) connectors. Make sure they seat and latch correctly.

5. Operate the system and determine the concern is still present.

Is the concern still present?






26. CHECK THE RFA (Remote Function Actuator) MODULE FOR CORRECT OPERATION

1. Ignition OFF.

2. Disconnect and inspect the RFA (Remote Function Actuator) module connectors.

3. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary

4. Reconnect the RFA (Remote Function Actuator) module connectors. Make sure they seat and latch correctly.

5. Operate the system and determine the concern is still present.

Is the concern still present?






27. CHECK THE SOD-L (Side Obstacle Detection Control Module - Left) FOR CORRECT OPERATION

1. Ignition OFF.

2. Disconnect and inspect the SOD-L (Side Obstacle Detection Control Module - Left) connector.

3. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary

4. Reconnect the SOD-L (Side Obstacle Detection Control Module - Left) connector. Make sure it seats and latches correctly.

5. Operate the system and determine the concern is still present.

Is the concern still present?






28. CHECK THE SOD-R (Side Obstacle Detection Control Module - Right) FOR CORRECT OPERATION

1. Ignition OFF.

2. Disconnect and inspect the SOD-R (Side Obstacle Detection Control Module - Right) connector.

3. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary

4. Reconnect the SOD-R (Side Obstacle Detection Control Module - Right) connector. Make sure it seats and latches correctly.

5. Operate the system and determine the concern is still present.

Is the concern still present?






29. CHECK THE TPM (Tire Pressure Monitor) MODULE FOR CORRECT OPERATION

1. Ignition OFF.

2. Disconnect and inspect the TPM (Tire Pressure Monitor) module connector.

3. Repair:

- corrosion (install new connector or terminals- clean module pins)
- damaged or bent pins- install new terminals/pins
- pushed-out pins- install new pins as necessary

4. Reconnect the TPM (Tire Pressure Monitor) module connector. Make sure it seats and latches correctly.

5. Operate the system and determine the concern is still present.

Is the concern still present?





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