GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2002 🢒 Envoy - 2WD 🢒 Brakes 🢒 Antilock Brake System 🢒 Low Traction Indicator Always On

Circuit Description

The ignition 1 voltage circuit supplies 12 volts to the traction control switch. The EBCM illuminates the low traction indicator by applying ground to the traction control active signal circuit.

Diagnostic Aids

Thoroughly inspect connections or circuitry that may cause an intermittent malfunction. Refer to the following:

    •  Testing for Electrical Intermittents
    •  Testing for Intermittent Conditions and Poor Connections
    •  Wiring Repairs
    •  Connector Repairs

Test Description

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

  1. This step tests for proper operation of the low traction indicator circuitry.

Step

Action

Yes

No

Schematic Reference: Antilock Brake System Schematics

1

Did you perform the ABS Diagnostic System Check?

Go to Step 2

Go to Diagnostic System Check - ABS

2
  1. Turn OFF the ignition for 5 seconds.
  2. Turn ON the ignition while observing the low traction indicator.

Does the low traction indicator illuminate for 3 seconds and then turn OFF?

Go to Diagnostic Aids

Go to Step 3

3
  1. Select the Traction Assist Data Display function on the scan tool.
  2. Observe the Low Traction Lamp Command.

Does the scan tool display On?

Go to Step 7

Go to Step 4

4

Important: The EBCM sets DTC C0283 during this step if the ignition is ON for greater than 10 seconds.

  1. Turn OFF the ignition.
  2. Disconnect the traction control switch harness connector. Refer to Electronic Traction Control Switch Replacement .
  3. Connect a test lamp between the traction control active signal circuit and the ignition 1 voltage circuit.
  4. Turn ON the ignition.

Does the test lamp illuminate for 3 seconds and then turn OFF?

Go to Step 6

Go to Step 5

5

Test the traction control active signal circuit 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 8

Go to Step 7

6

Replace the traction control switch. Refer to Electronic Traction Control Switch Replacement .

Did you complete the replacement?

Go to Step 8

--

7

Important: Following EBCM replacement, use the scan tool to perform the Tire Size Calibration procedure.

Replace the EBCM. Refer to Electronic Brake Control Module Replacement .

Did you complete the replacement?

Go to Step 8

--

8
  1. Turn OFF the ignition for 5 seconds.
  2. Turn ON the ignition while observing the low traction indicator.

Does the low traction indicator illuminate for 3 seconds and then turn OFF?

System OK

Go to Step 3