Instrument Cluster Dim Input Test
WARNING: This page is about a different car, the 1997 Pontiac Bonneville. However, it is still accessible from the selected car via links, so may be relevant.
- Turn ignition off. Disconnect instrument panel connector C2. Put headlight switch in PARK or HEAD position. Put dimmer switch in LO position. Measure voltage between ground and instrument cluster connector C2, terminal B6 (Gray wire - without boost gauge), or connector C2, terminal B3 (Gray wire - with boost gauge). If battery voltage is not present, check Gray wire for an open or short circuit to ground. Check headlight switch for good terminal contact and repair as necessary. If all circuits are okay, replace headlight switch.
- If battery voltage is present, measure voltage between ground and instrument cluster connector C1 or C2 terminal A4 (Gray wire - without boost gauge), or connector C1, terminal B16 (Gray wire - with boost gauge), while adjusting dimmer. If voltage does not vary with dimmer control, check Gray wire for open circuit, high resistance, or short to ground. Also check headlight switch for good terminal contact. If all circuits are okay, replace headlight switch.
- If voltage varies with dimmer control, check instrument cluster connector for good terminal contact at terminals A4 and B6 (Gray wires), or connector C1, terminal B16, and connector C2, terminal B3 (Gray wires - with boost gauge).