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HOMESERVICE MANUALSCHEVROLET2006CHEVY EXPRESS G2500, VAN CARGO, 6.6 2REPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 2133 (LIGHTING SYSTEM)DIAGNOSTIC INFORMATION AND PROCEDURESSTOP LAMPS MALFUNCTIONCIRCUIT/SYSTEM TESTING
2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2

Circuit/System Testing

2006 Chevrolet Chevy Express G2500, Van Cargo, 6.6 2SECTION Circuit/System Testing
WARNING: This page does not describe the selected car, but rather 8 other vehicles, including the 2012 GMC Yukon XL, 2012 GMC Yukon, 2012 Chevrolet Tahoe, 2012 Chevrolet Suburban, and 2012 Chevrolet Avalanche. However, it is still accessible from the selected car via links, so may be relevant.

Brake Pedal Position Sensor Malfunction

  1. Ignition OFF, disconnect the harness connector at the brake pedal position sensor.
  2. Ignition ON, verify that a test lamp does not illuminate between the low reference circuit terminal 2 and ground.
    • If the test lamp illuminates, test the low reference circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  3. Ignition ON, test for 4.8 V and 5.2 V between the 5 V reference circuit terminal 1 and ground.
    • If less than the specified range, test the 5 V reference circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
    • If greater than the specified range, test the 5 V reference circuit for a short to voltage. If the circuit tests normal, replace the BCM.
  4. If all circuits test normal, replace the brake pedal position sensor.

Stop Lamp Malfunction

  1. Ignition OFF, disconnect the harness connector X4 at the BCM.
  2. Ignition ON, verify that a test lamp illuminates between the stop lamp B+ circuit terminal 4 and ground.
    • If the test lamp does not illuminate, and the STOP LAMPS fuse tests normal, test the B+ circuit for a short to ground or an open/high resistance.
  3. Connect the harness connector X4 at the BCM.
  4. Ignition OFF, disconnect the harness connector at the appropriate stop lamp.
  5. Test for less than 5 Ξ© between the appropriate ground circuit terminal listed below and ground:
    • Tail/Stop and Turn Signal Lamp - Left and Right - Upper and Lower terminal GRD - with Z75 - E52
    • Tail Lamp Circuit Board - Left and Right terminal D - with Z75 + E52 and European
    • Tail/Stop Lamp - Left and Right terminal GRD - with X88
    • Tail/Stop Lamp - Left terminal C X411 - Z88 with E52
    • Tail/Stop Lamp - Left terminal B X411 - Z88 without E52
    • Tail/Stop Lamp - Right terminal C X412 - Z88 with E52
    • Tail/Stop Lamp - Right terminal B X412 - Z88 without E52
    • Tail/Stop Lamp - Left and Right terminal 2 - with HP2
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  6. Connect a test lamp between the appropriate stop lamp control circuit terminal listed below and ground.
    • Tail/Stop and Turn Signal Lamp - Left and Right - Upper and Lower terminal MJR - with Z75 - E52
    • Tail Lamp Circuit Board - Left and Right terminal E - with Z75 + E52 and European
    • Tail/Stop Lamp - Left and Right terminal MJR - with X88
    • Tail/Stop Lamp - Left and Right terminal A - Z88
    • Tail/Stop Lamp - Left and Right terminal 1 - with HP2
  7. Ignition ON, press and release the brake pedal. The test lamp should turn ON and OFF when changing between the selected states.
    • If the test lamp is always ON, test the control circuit for a short to voltage.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance.
  8. If all circuits test normal, test or replace the stop lamp.

Center High Mounted Stop Lamp Malfunction

  1. Ignition OFF, disconnect the harness connector X4 at the BCM.
  2. Ignition ON, verify a test lamp illuminates between the B+ circuit terminal 4 and ground.
    • If the test lamp does not illuminate, test the B+ circuit for an open/high resistance or short to ground.
  3. Reconnect the harness connector X4 at the BCM.
  4. Ignition OFF, disconnect the harness connector at the center high mounted stop lamp.
  5. Test for less than 5 Ξ© between the ground circuit terminal B and ground.
    • If greater than the specified range, test the ground circuit for an open/high resistance.
  6. Connect a test lamp between the stop lamp control circuit terminal A and ground circuit terminal B.
  7. Ignition ON, press and release the brake pedal. The test lamp should turn ON and OFF when changing between the selected states.
    • If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the BCM.
    • If the test lamp is always OFF, test the control circuit for a short to ground or an open/high resistance. If the circuit tests normal, replace the BCM.
  8. If all circuits test normal, test or replace the center high mounted stop lamp.
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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

  • β€’ You smell fuel, burning insulation, or see smoke.
  • β€’ Brakes feel soft, pull hard to one side, or make grinding noises.
  • β€’ The engine overheats, stalls repeatedly, or misfires under load.
  • β€’ You are missing required tools, torque specs, or safe lifting equipment.
  • β€’ You are not confident in the next step or safety outcome.