GM Service Manual Online
For 1990-2009 cars only

Object Number: 393822  Size: MF
ABS Components
Antilock Brake System Schematics
Instrument Cluster: Analog Schematics
Data Link Connector Schematics
Handling Electrostatic Discharge Sensitive Parts Notice
Handling Electrostatic Discharge Sensitive Parts Notice

Circuit Description

The Instrument Panel Cluster (IPC) turns the LOW TRAC Indicator on during the IPC bulb check for approximately 3 seconds when the ignition switch is turned to the RUN position. The LOW TRAC indicator is controlled by the EBTCM. The LOW TRAC indicator is activated (turned On) during a traction control event only. When the EBTCM detects a low traction condition it turns on the LOW TRAC indicator by sending a Class 2 message to the IPC.

Diagnostic Aids

    • It is very important that a thorough inspection of the wiring and connectors be performed. Failure to carefully and fully inspect wiring and connectors may result in misdiagnosis, causing part replacement with reappearance of the malfunction.
    • Thoroughly inspect any circuitry that may be causing the complaint for the following conditions:
       - Backed out terminals
       - Improper mating
       - Broken locks
       - Improperly formed or damaged terminals
       - Poor terminal-to-wiring connections
       - Physical damage to the wiring harness
    • The following conditions may cause an intermittent malfunction:
       - A poor connection
       - Rubbed-through wire insulation
       - A broken wire inside the insulation
    • If an intermittent malfunction exists refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.

Low traction indicator always ON

Step

Action

Value(s)

Yes

No

DEFINITION: LOW TRAC Indicator does not turn off after the Instrument Panel Cluster (IPC) bulb check and no ABS/TCS DTC(s) set.

1

Was the Diagnostic System Check performed?

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Go to Step 2

Go to Diagnostic System Check - ABS

2

  1. Connect a scan tool to the data link connector.
  2. Turn the ignition switch to the RUN position.
  3. Go to Output Controls in the Instrument Panel display.
  4. Use the WOW mode to turn ON and OFF all of the instrument panel indicators.
  5. The LOW TRAC indicator should turn ON and then OFF when commanded so.

Will the scan tool command the LOW TRAC indicator ON then OFF?

--

Go to Step 3

Go to Step 4

3

Replace the EBTCM. Refer to Electronic Brake Control Module/Electronic Brake and Track Control Module Replacement .

Is the replacement complete?

--

Go to Diagnostic System Check - ABS

--

4

Suspect the Instrument Panel. Refer to Diagnostic System Check - Instrument Cluster in Instrument Panel, Gauges and Console.

Is the repair complete?

--

Go to Diagnostic System Check - ABS

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