GM Service Manual Online
For 1990-2009 cars only

TCS Switch Lamp Inoperative

Step

Action

Value(s)

Yes

No

1

Were you sent here for the Interior Lights Dimming Diagnostic System Check?

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Go to Step 2

Go To Interior Lights Dimming Diagnostic System Check

2

  1. Disconnect the electronic traction suspension control switch connector.
  2. Connect a DMM between the electronic traction suspension control switch connector terminal 10 and ground.
  3. Turn the headlamp switch to the PARK position.
  4. Measure the voltage at the electronic traction suspension control switch lamp terminal 10.

Is the voltage within the specified values?

10.0-14.0V

Go to Step 6

Go to Step 3

3

Is the instrument cluster illumination lamps and the fog lamp/rear compartment lid release switch (domestic) or fog lamp switch (export) illumination lamps inoperative?

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Go to Step 4

Go to Step 5

4

Replace the headlamp switch.

Is the repair complete?

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Go To Interior Lights Dimming Diagnostic System Check

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5

Repair the open in CKT 9 between the headlamp switch and the electronic traction suspension control switch.

Is the repair complete?

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Go To Interior Lights Dimming Diagnostic System Check

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6

  1. Disconnect the BCM connector C3.
  2. Connect a DMM between the BCM connector C3 terminal B1 and the electronic traction suspension control switch connector terminal 9.
  3. Check for continuity in CKT 1244 between the BCM connector C3 terminal B1 and the electronic traction suspension control switch connector terminal 9.

Is the CKT 1244 continuous between these connectors?

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Go to Step 7

Go to Step 8

7

Repair the open in CKT 1244 between the BCM and the electronic traction suspension control switch.

Is the repair complete?

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Go To Interior Lights Dimming Diagnostic System Check

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8

  1. Reconnect the electronic traction suspension control switch connector.
  2. Place a fused jumper (10 A) between the Body Control Module (BCM) connector C3 terminal B1 and ground.
  3. Turn the headlamp switch to the PARK position.

Does the electronic traction suspension control switch illumination lamp turn ON?

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Go to Step 9

Go to Step 10

9

Replace the Body Control Module .

Is the repair complete?

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Go To Interior Lights Dimming Diagnostic System Check

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10

Replace the electronic traction suspension control switch illumination lamp.

Is the repair complete?

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Go To Interior Lights Dimming Diagnostic System Check

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