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Home >> Pontiac >> 2008 >> Torrent GXP, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 87 (Lighting Systems) >> Diagnostic Information and Procedures >> Stop Lamps Malfunction >> Circuit/System Testing >> Center High Mounted Stop Lamp (CHMSL) Malfunction

Center High Mounted Stop Lamp (CHMSL) Malfunction

WARNING: This page is about a different car, the 2009 Pontiac Torrent and 2009 Chevrolet Equinox. However, it is still accessible from the selected car via links, so may be relevant.
  1. Ignition OFF, disconnect the harness connector at the CHMSL.
  2. Ignition OFF, exterior lamps OFF, test for less than 5.0 ohms between the ground circuit terminal 2 and ground.
    • If the test lamp does not illuminate, test the ground circuit for an open/high resistance.
  3. Connect a test lamp between the control circuit terminal 1 and ground.
  4. Ignition ON, command the stop lamps ON and OFF by applying and releasing the brake pedal. The test lamp should turn ON and OFF when changing between the commanded 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.
  5. If all circuits test normal, replace the CHMSL.
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