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Instrument Cluster Test 5A - Cluster Illumination

NOTE: Perform INSTRUMENT CLUSTER TEST 1A  before proceeding with this test. For connector terminal identification, refer to CONNECTOR IDENTIFICATION  . For wiring diagrams, refer to WIRING DIAGRAMS  . Perform, after each repair, VERIFICATION TEST VER-1A - VERIFICATION PROCEDURE  .
CAUTION: Always turn ignition switch to OFF position prior to disconnecting or connecting any module connector.
  1. Remove and inspect junction block fuse No. 1. See Figure in EXTERIOR LIGHT TEST 4A. If fuse is open, go to INSTRUMENT CLUSTER TEST 5B  . If fuse is okay, go to next step.
  2. Turn parking lights on. If parking lights illuminate, go to next step. If parking lights do not illuminate, go to EXTERIOR LIGHT TEST 1A  .
  3. Using scan tool, read parking lamp switch status. If scan tool displays PARK LAMP ON, go to next step. If scan tool does not display PARK LAMP ON, go to INSTRUMENT CLUSTER TEST 5C  .
  4. Using scan tool, read panel lamp sensor voltage. If scan tool displays zero volts, go to next step. If scan tool displays voltage, go to step 6).
  5. While using scan tool to read panel light sensor voltage, rotate dimmer control switch between high and low. If voltage changes, go to next step. If voltage does not change, go to INSTRUMENT CLUSTER TEST 5D  .
  6. Ensure parking lights are on and dimmer switch is at midway position. Locate junction block 36-pin connectors "A" and "C". See Figure . Go to next step.
  7. Using scan tool in voltmeter mode, measure voltage on each panel lamp driver terminal (Orange wire). See Figure in EXTERIOR LIGHT TEST 2A. See PANEL LAMP DRIVER TERMINAL IDENTIFICATION table. While backprobing each terminal, rotate dimmer switch from low to high. If voltage increases from zero volts to about 12 volts at all terminals, go to next step. If voltage does not increase at any terminal, replace junction block.
    PANEL LAMP DRIVER TERMINAL IDENTIFICATION

    Connector Terminal No.
    Connector "A" 1 & 8
    Connector "C" 1, 8, 23 & 30
  8. Disconnect instrument cluster 13-pin connector and ensure connector is clean and not damaged. Using scan tool in voltmeter mode, measure voltage at terminal No. 6 (Orange wire) on instrument cluster Blue 13-pin connector. If voltage is more than 5 volts, go to next step. If voltage is 5 volts or less, repair open in Orange wire between instrument cluster and junction block.
  9. Using scan tool in ohmmeter mode, measure resistance at terminal No. 7 (Black/Light Green wire) on instrument cluster Blue 13-pin connector. If resistance is 20 ohms or greater, repair open Black/Light Green wire. If resistance is less than 5 ohms, go to next step.
  10. If problem is only with instrument cluster illumination, replace instrument cluster circuit board. Recalibrate gauges using scan tool. If problem is with a specific light, inspect bulb. If bulb is okay, repair open in suspect indicator light driver and/or ground circuits.
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