GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Saab 🢒 2009 🢒 9-7x 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Service Indicator Inoperative

Circuit Description

The SERVICE AWD indicator is located in the instrument cluster. It shares the instrument cluster common power and ground. The transfer case shift control module controls the SERVICE AWD indicator by sending the instrument cluster a Class 2 message. This lamp may be controlled with the scan tool using the instrument cluster device controls.

Test Description

The number below refers to the step number on the diagnostic table.

  1. This step determines whether the failure is the result of a faulty transfer case shift control module or the instrument cluster.

Step

Action

Value(s)

Yes

No

1

Did you perform the Diagnostic System Check - Vehicle?

--

Go to Step 2

Go to Diagnostic System Check - Vehicle

2

  1. Turn the ignition ON, with the engine OFF.
  2. Install a scan tool.
  3. Using the scan tool, command the SERVICE AWD lamp ON.

Does the SERVICE AWD lamp turn ON?

--

Go to Step 3

Go to Diagnostic System Check - Vehicle

3

Note: After transfer case shift control module replacement and reprogramming, ensure all doors are closed and the key is out of the ignition, then open and close the doors again and wait 2 minutes to avoid incomplete programming or false communication DTCs.

Replace the transfer case shift control module. Refer to Control Module References for replacement, setup, and programming.

Did you complete the repair?

--

Go to Step 4

--

4
  1. Use the scan tool in order to clear the DTCs.
  2. Operate the vehicle in order to determine if the symptom has been corrected.

Is the symptom still present?

--

Go to Step 2

System OK