Test A: No Communication With the 4WD Control Module

Pinpoint Test A: No Communication With The 4WD Control Module

Normal Operation
In order for the 4WD control module to communicate with the diagnostic tool, the operating voltage required to supply the 4WD control module is in a range between 9 and 16 volts. Voltage is supplied at all times by circuit SBB26 (YE/RD). Run/Start voltage is supplied by circuit A_CBP18 (GY/OG).

Possible Causes
^ CAN communication
^ Diagnostic tool
^ Smart junction box (SJB) fuse 4 (20A)
^ Battery junction box (BJB) fuse 18 (10A)
^ Central junction box (CJB) fuse 26 (20A)
^ Power supply:
- Circuit SBB26 (YE/RD)
- Circuit A_CBP18 (GY/OG)
- Ground circuit GD145 (BK/BU)
- 4WD control module
- Charging system

CAUTION: Use the Flex Probe Kit for all test connections to prevent damage to the wiring terminals. Do not use standard multimeter probes.

A1-A4:

A4-A6:

PINPOINT TEST A: NO COMMUNICATION WITH THE 4WD CONTROL MODULE