Y21-Y39
Communications Network
Pinpoint Test Y: No High Speed Controller Area Network (HS-CAN) Communication, All Modules Are Not Responding
Normal Operation
The High Speed Controller Area Network (HS-CAN) uses an unshielded twisted pair cable.
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- 4X4 control module (if equipped)
- ABS module
- Accessory Protocol Interface Module (APIM) (if equipped)
- Body Control Module (BCM)
- Instrument Panel Cluster (IPC)
- Occupant Classification System (OCS) module
- Parking Aid Module (PAM) (if equipped)
- PCM
- Power Steering Control Module (PSCM) (if equipped)
- Restraints Control Module (RCM)
- Steering Column Control Module (SCCM)
- Telematics module
- Trailer Brake Control (TBC) module (if equipped)
PINPOINT TEST Y : NO HS-CAN (High Speed Controller Area Network) 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. Communications Network
NOTE: Failure to disconnect the battery when instructed results in false resistance readings.
Y21 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE SCCM (Steering Column Control Module) DISABLED
- Disconnect: Body Control Module (BCM) Fuse 23 (15A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
Do all other HS-CAN (High Speed Controller Area Network) modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test V. Pinpoint Test V: The Steering Column Control Module (SCCM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. If the vehicle is equipped with an Accessory Protocol Interface Module (APIM), GO to Y21.
If the vehicle is not equipped with an APIM (Accessory Protocol Interface Module), GO to Y22.
Y22 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE APIM (Accessory Protocol Interface Module) DISABLED
- Disconnect: BCM (Body Control Module) Fuse 2 (15A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
Do all other HS-CAN (High Speed Controller Area Network) modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test U. Pinpoint Test U: The Accessory Protocol Interface Module (APIM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to Y23.
Y23 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE BCM (Body Control Module) DISABLED
- Disconnect: BJB (Battery Junction Box) Fuse 18 (10A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
Do all other HS-CAN (High Speed Controller Area Network) modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test I. Pinpoint Test I: The Body Control Module (BCM) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. If the vehicle is equipped with an Trailer Brake Control (TBC), GO to Y24.
If the vehicle is not equipped with an TBC (Trailer Brake Control), GO to Y25.
Y24 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE TBC (Trailer Brake Control) MODULE DISABLED
- Disconnect: BCM (Body Control Module) Fuse 37 (10A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
Do all other HS-CAN (High Speed Controller Area Network) modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test G. Pinpoint Test G: The Trailer Brake Control (TBC) Module Does Not Respond To The Scan Tool
No
INSTALL the removed fuse. GO to Y25.
Y25 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE IPC (Instrument Panel Cluster) DISABLED
- Disconnect: BCM (Body Control Module) Fuse 11 (10A).
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
Do all other HS-CAN (High Speed Controller Area Network) modules pass the network test?
Yes
INSTALL the removed fuse. GO to Pinpoint Test C. Pinpoint Test C: The Instrument Panel Cluster (IPC) Does Not Respond To The Scan Tool
No
INSTALL the removed fuse.
If the vehicle is equipped with a telematics module, GO to Y26.
If the vehicle is not equipped with a telematics module, the HS-CAN (High Speed Controller Area Network) tests within specification. VERIFY the correct operation of the scan tool on a known good vehicle.
Y26 CHECK FOR RESTORED NETWORK COMMUNICATION WITH THE TELEMATICS MODULE DISCONNECTED
- Disconnect: Telematics Module C2409.
- Enter the following diagnostic mode on the scan tool: Network Test.
- Repeat the network test.
Do all other HS-CAN (High Speed Controller Area Network) modules pass the network test?
Yes
CONNECT the telematics module. GO to Y38.
No
CONNECT the telematics module. The HS-CAN (High Speed Controller Area Network) tests within specification. VERIFY the correct operation of the scan tool on a known good vehicle.
Y27 CHECK FOR CORRECT 4X4 CONTROL MODULE OPERATION
- Disconnect all the 4X4 control module connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the 4X4 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 new 4X4 control 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.
Y28 CHECK FOR CORRECT APIM (Accessory Protocol Interface Module) OPERATION
- Disconnect the APIM (Accessory Protocol Interface Module) connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the APIM (Accessory Protocol Interface 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 APIM (Accessory Protocol Interface 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.
Y29 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. 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.
Y30 CHECK FOR CORRECT BCM (Body Control Module) OPERATION
- Disconnect all the BCM (Body Control Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the BCM (Body 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 new BCM (Body Control Module). 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.
Y31 CHECK FOR CORRECT IPC (Instrument Panel Cluster) OPERATION
- Disconnect the IPC (Instrument Panel Cluster) connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the IPC (Instrument Panel 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 IPC (Instrument Panel Cluster). 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.
Y32 CHECK FOR CORRECT OCS (Occupant Classification System) module OPERATION
- Disconnect the OCS (Occupant Classification System) module connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the OCS (Occupant Classification System) module connector and make sure it seats correctly.
- Verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new OCS (Occupant Classification System) 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.
Y33 CHECK FOR CORRECT PAM (Parking Aid Module) OPERATION
- Disconnect the PAM (Parking Aid Module) connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the PAM (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 PAM (Parking Aid 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.
Y34 CHECK FOR CORRECT PSCM (Power Steering Control Module) OPERATION
- Disconnect all the PSCM (Power Steering Control Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the PSCM (Power Steering Control Module) connectors and make sure they seat correctly.
- Verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new EPAS (Electronic Power Assist Steering) steering gear. 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.
Y35 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. 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.
Y36 CHECK FOR CORRECT RCM (Restraints Control Module) OPERATION
- Disconnect all the RCM (Restraints Control Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the RCM (Restraints Control Module) connectors and make sure they seat correctly.
- Verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new RCM (Restraints Control 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.
Y37 CHECK FOR CORRECT SCCM (Steering Column Control Module) OPERATION
- Disconnect all the SCCM (Steering Column Control Module) connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the SCCM (Steering Column Control Module) connectors and make sure they seat correctly.
- Verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new SCCM (Steering Column Control 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.
Y38 CHECK FOR CORRECT TBC (Trailer Brake Control) MODULE OPERATION
- Disconnect the TBC (Trailer Brake Control) module connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the TBC (Trailer Brake Control) module connector and make sure it seats correctly.
- Verify the concern is still present.
Is the concern still present?
Yes
INSTALL a new TBC (Trailer Brake Control) 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.
Y39 CHECK FOR CORRECT TELEMATICS MODULE OPERATION
- Disconnect the telematics module connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the telematics 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 telematics module. 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.