Traction Control Indicator Always On. Pontiac Montana 1999

For 1990-2009 cars only

Makes 🢒 Pontiac 🢒 1999 🢒 Montana 🢒 Body and Accessories 🢒 Data Link Communications 🢒 Traction Control Indicator Always On

ABS Components
Antilock Brake System Schematics

Circuit Description

This symptom table tests the state of the TCS warning indicator in order to identify either of the following conditions:

•	The TCS warning indicator could not warn the driver of a system malfunction

•	The TCS warning indicator is always on

The EBCM/EBTCM must provide a ground in order to turn the amber TCS warning indicator off because of Malfunction Indicator Lamp Control Module (lamp driver module) in the circuit. Because of the circuitry in the integral Lamp Driver Module (LDM), only external malfunctions can be detected. As a result, the integral LDM is not diagnosable. If CKT 1572 is open, the TCS warning indicator will remain on due to the loss of ground at the integral LDM input. If the control line is shorted to ground, the TCS warning indicator will remain off. The TCS warning indicator will remain off because the integral LDM input will be grounded. DTC C1311 will set if any of the following conditions exist:

•	An open in CKT 1572

•	A short to ground on CKT 1572

•	A short to voltage in CKT 1572

Diagnostic Aids

Use the Lamp Test function of the Scan Tool in order to turn the indicator on while looking for an intermittent malfunction in the TCS warning indicator circuitry.

Thoroughly inspect any circuitry that may cause the intermittent complaint for the following conditions:

•	Rubbed-through wire insulation

•	A broken wire inside the insulation

•	Backed out terminals

•	Improper mating

•	Broken locks

•	Improperly formed or damaged terminals

•	Poor terminal-to-wiring connections

•	Physical damage to the wiring harness

Important: Zero the J 39200 test leads before making any resistance measurements.

Step

Action

Value(s)

Yes

Was the Diagnostic System Check performed?

Go to Step 2

Go to Diagnostic System Check - ABS

Turn the ignition switch to the OFF position.
Disconnect the EBCM/EBTCM connector C1.
Connect a fused jumper wire with a 3A fuse (such as J 36169-A ) between the 24-way EBCM/EBTCM harness connector C1 terminal B7 and ground.
Turn the ignition switch to the RUN position, engine off.

Is the TCS indicator off?

Go to Step 3

Go to Step 4

Turn the ignition switch to the OFF position.
Remove the fused jumper from the 24-way EBCM/EBTCM harness connector C1 terminal B7.
Inspect the 24-way EBCM/EBTCM connector C1 terminal B7 for the following conditions:

•	Signs of damage

•	Poor terminal contact

•	Terminal corrosion

Inspect the remaining terminals of the 24-way EBCM/EBTCM connector C1 for the following conditions:

•	Signs of damage

•	Poor terminal contact

•	Terminal corrosion

Are there signs of poor terminal contact, corrosion, or terminal corrosion?

Go to Step 6

Go to Step 10

Remove the Malfunction Indicator Lamp Traction Control Module from the Malfunction Indicator Lamp Traction Control Module connector.
Turn the ignition switch to the RUN position, engine off.

Is the TCS indicator off?

Go to Step 5

Go to Step 8

Turn the ignition switch to the RUN position, engine off.
Use the J 39200 in order to measure the voltage between the Malfunction Indicator Lamp Traction Control Module connector terminal B and ground.

Is the voltage measured greater than the specified voltage?

10 V

Go to Step 9

Go to Step 7

Replace all of the terminals or the connectors that exhibit signs of the following conditions:

•	Poor terminal contact

•	Terminal corrosion

•	Damaged terminals

Is the repair complete?

Go to Diagnostic System Check - ABS

Repair the open in CKT 39.

Is the repair complete?

Go to Diagnostic System Check - ABS

Repair the short to ground in CKT 1808.

Is the repair complete?

Go to Diagnostic System Check - ABS

Replace the Malfunction Indicator Lamp Traction Control Module. Refer to Lamp Driver Module Replacement .

Is the repair complete?

Go to Diagnostic System Check - ABS

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

Is the repair complete?

Go to Diagnostic System Check - ABS