Test F: The Headlamp Control Module (HCM) Does Not Respond To The Scan Tool
PINPOINT TEST F: THE HEADLAMP CONTROL MODULE (HCM) DOES NOT RESPOND TO THE SCAN TOOLNormal Operation
The headlamp control module (HCM) communicates with the scan tool through the high speed controller area network (HS-CAN). Circuits VDB04 (WH/BU) (HS-CAN +) and VDB05 (WH) (HS-CAN -) provide the network connection to the HCM. The HCM shares the HS-CAN with the PCM, the accessory protocol interface module (APIM), the ABS module, the 4X4 control module (if equipped), the restraints control module (RCM), the occupant classification system module (OCSM), the steering angle sensor module (SASM) (if equipped) and the instrument cluster (IC). Voltage to the HCM is supplied by circuit CBB51 (BN). Ground is supplied by circuit GD120 (BK/GN).
This pinpoint test is intended to diagnose the following:
- Fuse
- Wiring, terminals or connectors
- HCM