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Test 60A - Diagnosing Instrument Cluster Illumination Problem

NOTE: Perform TEST 54A  before proceeding with this test. For connector terminal ID, see CONNECTOR IDENTIFICATION  . For wiring schematics, see WIRING DIAGRAMS  in this article. Perform TEST VER-1 - VERIFICATION PROCEDURE  after each repair.
CAUTION: Always turn ignition off prior to disconnecting any module connector.
  1. Using scan tool, read Body Control Module (BCM) DTCs. If scan tool displays PANEL LAMP PWM OUTPUT FAILURE, go to TEST 60B  . If scan tool does not display PANEL LAMP PWM OUTPUT FAILURE, go to next step.
  2. Ensure parking lamp switch is in OFF position. If parking lamps illuminate with parking lamp switch in OFF position, go to TEST 60C  . If parking lamps do not illuminate, go to next step.
  3. Turn parking lamps on. If parking lamps do not illuminate, go to TEST 61A  . If parking lamps illuminate, go to next step.
  4. Move dimmer switch to high. If both turn signal indicators and high beam indicator do not illuminate with parking lamps on, go to step 6). If both turn signal indicators and high beam indicator illuminate with parking lamps on, go to next step.
  5. Turn parking lamps off. Ensure ignition switch is in OFF position. Disconnect instrument cluster connectors. Using scan tool in ohmmeter mode, measure resistance at terminal No. 3 (Black wire) on instrument cluster Gray connector. If resistance is 5 ohms or greater, repair open Black wire. If resistance is less than 5 ohms, repair or replace instrument cluster. See appropriate INSTRUMENT PANEL article in the ACCESSORIES & ELECTRICAL section.
  6. Using scan tool, read panel lamp sensor voltage. Rotate dimmer switch to low, then high. If voltage changes evenly between 10 and zero volts, go to TEST 62A  . If voltage does not change evenly between 10 and zero volts, and scan tool displays 0.0 VOLT, go to TEST 63A  . If scan tool does not displays 0.0 VOLT, and panel lamps illuminate properly, system is operating properly at this time. If panel lamps do not illuminate properly, go to next step.
  7. Disconnect headlight switch connector. Disconnect Body Control Module (BCM) connectors. BCM is located behind right kick panel. Turn ignition on. Using scan tool in voltmeter mode, measure voltage at terminal No. 4 (Orange/Dark Blue wire) on BCM Bone connector. If voltage is more than 10 volts, repair short to battery voltage in Orange/Dark Blue wire. If voltage is less than 10 volts, replace BCM.
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