Test G: No Communication With The Four Wheel Drive (4WD) Control Module (GEM)

Pinpoint Tests

Pinpoint Test G: No Communication With the 4X4 Control Module

Normal Operation

In order for the 4X4 control module to communicate with the diagnostic tool the operating voltage required to supply the 4X4 control module is in a range between 9 and 16 volts.

Possible Causes

^ Power supply circuits

^ 1306a(PKIWH)
^ 1306c(PKIWH)

^ Ignition circuits:

^ 295 (LB/PK)
^ 640 (RD/YE)
^ 1002 (BK/PK)

^ Central junction box (CIB) fuses:

^ 19(1OA)
^ 45 (1OA)
^ 33 (15A)

^ Charging system
^ Battery

PINPOINT TEST G: NO COMMUNICATION WITH THE CONTROL MODULE

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