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Y36-Y52




Communications Network

Pinpoint Tests

Pinpoint Test Y: 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. Circuits VDB06 (GY/OG) and VDB07 (VT/OG) provide the network connection to all modules on the network.

This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Accessory Protocol Interface Module (APIM)
- Audio Control Module (ACM)
- Audio Digital Signal Processing (DSP) module
- Driver Door Module (DDM)
- Driver Seat Module (DSM)
- Dual Climate Controlled Seat Module (DCSM)
- Front Controls Interface Module (FCIM)
- Front Display Interface Module (FDIM)
- Headlamp Control Module 2 (HCM-2)
- HVAC module
- Instrument Panel Cluster (IPC)
- Parking Aid Module (PAM)
- Remote Function Actuator (RFA) module
- Smart Junction Box (SJB)



PINPOINT TEST Y: 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.

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Y36 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE FCIM DISCONNECTED


- Disconnect: Front Controls Interface Module (FCIM) C2402 (Without Navigation ACM) or C2403 (With Navigation ACM).
- 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 1,000 ohms?

Yes
CONNECT the battery ground cable. GO to Y50.

No
If the vehicle is equipped with an Accessory Protocol Interface Module (APIM), GO to Y37.

If the vehicle is not equipped with an APIM, GO to Y38.

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Y37 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE APIM DISCONNECTED


- Disconnect: APIM C3342.
- 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 1,000 ohms?

Yes
CONNECT the battery ground cable. GO to Y51.

No
GO to Y38.

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Y38 CHECK THE MS-CAN (+) AND MS-CAN (-) CIRCUITS FOR A SHORT TO GROUND WITH THE IPC DISCONNECTED


- Disconnect: IPC 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 1,000 ohms?

Yes
CONNECT the battery ground cable. GO to Y52.

No
REPAIR the circuit. CONNECT all modules. CONNECT the battery ground cable. CLEAR the DTCs. REPEAT the network test with the scan tool.

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Y39 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. 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.

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Y40 CHECK FOR CORRECT PAM OPERATION


- Disconnect the PAM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the PAM connector and make it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new PAM. 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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Y41 CHECK FOR CORRECT ACM OPERATION


- Disconnect all the ACM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the ACM 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 ACM. 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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Y42 CHECK FOR CORRECT AUDIO DSP MODULE OPERATION


- Disconnect all the audio DSP module connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the audio DSP 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 audio DSP module. 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. CLEAR the DTCs. CONNECT all modules. REPEAT the network test with the scan tool.

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Y43 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. 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. CLEAR the DTCs. CONNECT all modules. REPEAT the network test with the scan tool.

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Y44 CHECK FOR CORRECT RFA MODULE OPERATION


- Disconnect all the RFA module connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the RFA 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 RFA module. 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. CLEAR the DTCs. CONNECT all modules. REPEAT the network test with the scan tool.

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Y45 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. 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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Y46 CHECK FOR CORRECT HCM-2 OPERATION


- Disconnect all the HCM-2 connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the HCM-2 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 HCM-2. 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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Y47 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. 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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Y48 CHECK FOR CORRECT FDIM OPERATION


- Disconnect the FDIM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the FDIM 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 FDIM. 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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Y49 CHECK FOR CORRECT HVAC MODULE OPERATION


- Disconnect all the HVAC module connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the HVAC 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 HVAC module. 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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Y50 CHECK FOR CORRECT FCIM OPERATION


- Disconnect the FCIM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the FCIM 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 FCIM. 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.

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Y51 CHECK FOR CORRECT APIM OPERATION


- Disconnect all the APIM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the APIM 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 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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Y52 CHECK FOR CORRECT IPC OPERATION


- Disconnect the IPC connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IPC connector and make it seats correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?

Yes
INSTALL a new IPC. 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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