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For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1997 🢒 Catera 🢒 Brakes 🢒 Antilock Brake System 🢒 Traction Control Indicator Always On

Object Number: 174404 Size: SF
ABS Components
Antilock Brake System Schematics

Circuit Description

This symptom table checks the state of the TC indicator to identify a situation in which the TC indicator is always on. The EBTCM provides a ground through the TC indicator control circuit to turn the TC indicator on. If the control circuit is shorted to ground, the TC indicator will always be on when the ignition switch is the RUN position. The TC indicator will also turn on if the electronic traction control switch is pressed. The TC indicator will turn off and the TCS reactivated by pressing the switch again or automatically the next time the ignition switch is turned to the RUN position. Flashing of the TC indicator indicates that the traction control is active.

Diagnostic Aids

The following can cause an intermittent malfunction:

    • A poor connection can cause an intermittent malfunction.
    • Rubbed through wire insulation can cause an intermittent malfunction.
    • A wire that is broken inside the insulation can cause an intermittent malfunction.

The TCS Indicator Lamp Test function of the scan tool may be used to command the indicator while looking for an intermittent malfunction in the TC indicator circuitry.

Check for the following in any circuit suspected of causing an intermittent malfunction:

    • Check for backed out terminals.
    • Check for improper mating.
    • Check for broken locks.
    • Check for improperly formed terminals.
    • Check for damaged terminals.
    • Check for poor terminal to wiring connections.
    • Check for physical damage to the wiring harness.

Test Description

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

  1. Running the scan tool Lamp Test will determine if the EBTCM can turn the indicator on and off.

    2.

  2. This step checks for a short to ground in the TC indicator circuit.

TCS Indicator On No DTC Set

Step

Action

Value(s)

Yes

No

1

Was the Diagnostic System Check performed?

--

Go to Step 2

Go to A Diagnostic System Check

2
  1. Turn the ignition switch to the OFF position.
  2. Install a scan tool.
  3. Turn the ignition switch to the RUN position with the engine off.
  4. Use the scan tool to select Special Functions.
  5. Select and run TCS Indicator Lamp Test in Special Functions.

Was the test completed successfully?

--

Go to Step 12

Go to Step 3

3
  1. Turn the ignition switch to the OFF position.
  2. Remove the scan tool.
  3. Turn the ignition switch to the RUN position with the engine off.

Does the TC indicator turn on and stay on?

--

Go to Step 4

Go to Step 12

4
  1. Turn the ignition switch to the OFF position.
  2. Disconnect the 25-way EBTCM connector C1.
  3. Turn the ignition switch to the RUN position with the engine off.

Does the TC indicator turn on and stay on?

--

Go to Step 8

Go to Step 5

5
  1. Turn the ignition switch to the OFF position.
  2. Inspect the 25-way EBTCM connector C1, terminal 25 for the following signs:
    3. • Inspect for signs of damage.
    • Inspect for signs of poor terminal contact.
    • Inspect for signs of terminal corrosion.
  3. Inspect the remaining terminals of the 25-way EBTCM connector C1 for the following signs:
    4. • Inspect for signs of damage.
    • Inspect for signs of poor terminal contact.
    • Inspect for signs of terminal corrosion.

Are the following signs evident:

    • Is poor terminal contact evident?
    • Is corrosion evident?
    • Is damaged terminal(s) evident?

--

Go to Step 9

Go to Step 6

6
  1. Install the J 39700 Universal Breakout Box with the J 39700-250 Cable Adapter to the EBTCM Harness connector only.
  2. Using the J 39200 DMM, measure the resistance between the J 39700 terminal 13 and ground.

Is the resistance within the specified range?

OL (Infinite)

Go to Step 7

Go to Step 10

7
  1. Reconnect the 25-way EBTCM harness connector C1.
  2. Turn the ignition switch to the RUN position with the engine off.

Does the TC indicator turn on and stay on?

--

Go to Step 11

Go to Step 12

8

Repair a short to ground in the TC indicator circuit. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to A Diagnostic System Check

--

9

Repair the 25-way EBTCM connector C1. Refer to Connector Repairs in Wiring Systems.

Is the repair complete?

--

Go to A Diagnostic System Check

--

10

Repair the short to ground in circuit XA105 or short to ground in the Electronic Traction Control Switch. If the circuit or switch is not shorted to ground, check for a sticking Electronic Traction Control Switch. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to A Diagnostic System Check

--

11

Replace the EBTCM. Refer to EBTCM Replacement .

Is the repair complete?

--

Go to A Diagnostic System Check

--

12

The malfunction is intermittent or the malfunction is not present at this time. Refer to Diagnostic Aids on the facing page for more information.

Is the diagnosis complete?

--

Go to A Diagnostic System Check

--