Preliminary Checks

1. With throttle in hot idle position, check cruise servo and throttle linkage for minimum slack.
2. Inspect vacuum hoses for leaks, kinks or restrictions, repairing or replacing as necessary.
3. Visually inspect cruise control wire and ground connections.
4. If cruise On indicator or cruise control panel light do not light, on 1989 models, check 155 black, wire for open, on 1990 models, check 803 black/white, wire for open.
5. With cruise control engaged, if cruise On indicator does not light, check bulb. If bulb is good, replace cruise control switch.
6. On 1989 models, if cruise ``Engaged'' indicator does not light, ground terminal D4 connector C1 of ECM. If indicator works, check ECM for terminal contact. If contact is good, replace ECM. When grounded, if indicator does not light, check bulb and wiring.
7. On 1990 models, if cruise ``Engaged'' indicator does not light, check stored diagnostic codes. Ground BCM terminal A1 connector C1, if indicator does not light, check bulb and wiring. If indicator works, check BCM for terminal contact. If contact is good, replace BCM.