GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

  1. Disconnect the instrument cluster head-up display (HUD) harness connector.
  2. Turn the ignition switch to the RUN position.
  3. Set the turn signal switch to the right turn position.
  4. Use a DMM in order to measure the voltage between the instrument cluster HUD harness connector terminal B8 and ground.

Is the measured voltage within the specified value?

Voltage cycles from 0 to 9-14 Volts

Go to Step 4

Go to Step 2

2

  1. Disconnect the harness connector C201.
  2. Turn the ignition switch to the RUN position.
  3. Set the turn signal switch to the right turn position.
  4. Use a DMM in order to measure the voltage between the harness connector C201 terminal A6 and ground.

Is the measured voltage within the specified value?

Voltage cycles from 0 to 9-14 Volts

Go to Step 3

Refer to Lighting Systems

3

  1. Repair the open in CKT 15 between the instrument cluster HUD dimmer switch harness connector terminal B7 and harness connector C201 terminal A6.
  2. Inspect the system.

Is the symptom still present?

--

--

System OK

4

  1. Replace the instrument cluster head-up display (HUD). Refer to Head Up Display Module Replacement .
  2. Inspect the system.

Is the symptom still present?

--

--

System OK