C1206 Rear Axle Isolation Valve

POSSIBLE SOURCE(S):
- Open/shorted valve solenoid.
- Open/shorted valve Circuit 499 (GY/BK) between the antilock brake control module and HCU.
- Shorted/open antilock brake control module valve driver.
- Defective valve feedback circuit within antilock brake control module.
- Circuit 499 shorted to ground.

ACTION(S) TO TAKE:
- Go to Pinpoint Test G.