Shift Light (Manual Transmission)
- These tests assume a shift light problem exists. Use this procedure only if shift light will not illuminate or illuminates all of the time.
- Turn ignition on, with engine off. Note shift light. Shift light should not be on. If light is on, check for a short to ground between the bulb and the ECM, or for a bad ECM. See Fig 1
.
- With ignition on and engine off, ground test terminal of DLC. Malfunction Indicator Light (MIL) should start to flash and shift light should come on. If shift light does not come on, go to next step. If MIL does not flash, perform DIAGNOSTIC CIRCUIT CHECK in the BASIC TESTING
article in this section.
- If shift light does not come on, ground Tan/Black wire at appropriate ECM terminal using a jumper wire. If shift light still does not comes on, check for blown GAUGES fuse, blown bulb or open circuit between fuse and ECM.
- If shift light comes on when grounding ECM terminal with a jumper wire, problem is a bad ECM connection or bad ECM.
Courtesy of GENERAL MOTORS CORP.