Pinpoint Test 5: The Restraints Control Module (RCM) Does Not Respond to The Scan Tool

PINPOINT TEST 5: THE RESTRAINTS CONTROL MODULE (RCM) DOES NOT RESPOND TO THE SCAN TOOL

Normal Operation

The restraints control module (RCM) communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits (W/L) (HS-CAN +) and (W) (HS-CAN -) provide the HS-CAN connection to the RCM. The RCM shares the HS-CAN with the PCM, the ABS module, the 4X4 control module, the instrument cluster (IC), the power steering control module (PSCM) and the occupant classification sensor module (OCSM). Voltage for the RCM is provided by circuits (G/V) and the RCM is case grounded.

Possible Causes
- Fuse
- Wiring, terminals or connectors
- RCM

Diagnostic Procedure

WARNING:Never probe the electrical connectors on air bag, safety canopy or side air curtain modules. Failure to follow this instruction may result in the accidental deployment of these modules, which increases the risk of serious personal injury or death.

WARNING:Never probe the electrical connectors on safety belt buckle/retractor pretensioners or adaptive load limiting retractors. Failure to follow this instruction may result in the accidental deployment of the safety belt pretensioners or adaptive load limiting retractors, which increases the risk of serious personal injury or death.

CAUTION:Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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.
NOTE:Failure to disconnect the battery when instructed will result in false resistance readings. See Battery Disconnect.

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