GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 Yukon Denali 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Service Indicator Always On

Object Number: 562195 Size: MF
Transfer Case Control Components
Transfer Case Control Schematics

Test Description

The number(s) below refer to the step number(s) on the diagnostic table.

  1. Tests for the transfer case shift control module's ability to control the Service Indicator.

    2.

  2. Helps determine if the Service Indicator output circuit has a short to ground.

    3.

  3. Test the control circuit of the Service Indicator for a short to ground.

Service Indicator Stays ON When Key is ON

Step

Action

Value(s)

Yes

No

1

Did you perform the Transfer Case Diagnostic System Check?

--

Go to Step 2

Go to Diagnostic System Check

2

  1. Install a scan tool.
  2. Turn ON the ignition, with the engine OFF.
  3. With a scan tool, command the Service Indicator OFF.

Does the Service Indicator turn OFF?

--

Go to Step 6

Go to Step 3

3

  1. Turn OFF the ignition.
  2. Disconnect the transfer case shift control module.
  3. Turn ON the ignition, with the engine OFF.

Does the Service Indicator turn OFF?

--

Go to Step 6

Go to Step 4

4

Test the control circuit of the Service Indicator for a short to ground. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

--

Go to Step 7

Go to Step 5

5

Service the instrument cluster for internal short to ground. Refer to Instrument Cluster replacement.

Did you complete the replacement?

--

Go to Step 7

--

6

Replace the transfer case shift control module. Refer to transfer case shift control module replacement.

Did you complete the replacement?

--

Go to Step 7

--

7
  1. Use the scan tool in order to clear the DTCs .
  2. Operate the vehicle within the Conditions for allowing the symptom to re-occur.

Does the symptom re-occur?

--

Go to Step 2

System OK