Test Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table.

2: This step tests the transfer case electrical control of the lamp circuits.
3: This step helps determine if there is a short to ground in the suspect indicator control circuits.

Transfer Case Shift Control Switch Indicator Always On - Two or More

Step	Action	Yes	No
Schematic Reference: Transfer Case Control Schematics Connector End View Reference: Transfer Case Control Connector End Views
1	Did you perform the Diagnostic System Check - Transfer Case?	Go to Step 2	Go to Diagnostic System Check - Transfer Case
2	Turn the ignition ON, with the engine OFF. Install a scan tool. Using the scan tool, command all the indicator lamps OFF. Do all the lamps go OFF?	Go to Step 5	Go to Step 3
3	Drive the vehicle to determine the transfer case mode. Use this information to determine which indicator control circuits are at fault. Disconnect the transfer case shift control switch. Test the suspect indicator control circuits for a short to ground. Refer to Testing for Short to Ground and Wiring Repairs in Wiring Systems. Did you find and correct the condition?	Go to Step 6	Go to Step 4
4	Replace the mode switch. Refer to Transfer Case Shift Control Switch Replacement . Did you complete the repair?	Go to Step 6	-
5	Replace the transfer case shift control module. Refer to Transfer Case Shift Control Module Replacement and Transfer Case Control Module Reprogramming . Did you complete the repair?	Go to Step 6	-
6	Use the scan tool in order to clear the DTCs. Operate the vehicle in order to determine if the symptom has been corrected. Is the symptom still present?	Go to Step 2	System OK