check 15 amp fuse (may be in engine compartment relay box). If fuse is good, check switch on transmission. To check the switch, pull the connector off and short the two outer terminals together. With the key on, the backup light should come on. If they do, replace the switch. The switch looks something like this:
The neutral safety switch, otherwise known as the park/neutral position switch, prevents the vehicle from being started in any position other than PARK and NEUTRAL. It also functions as the back-up lamp switch.
The neutral safely switch is threaded into the transmission case. When the gearshift lever is placed in either the PARK or NEUTRAL position, a cam, which is attached to the transmission throttle lever inside the transmission, contacts the neutral safety switch and provides a ground to complete the starter solenoid circuit. The back-up light switch is incorporated into the neutral safety switch.
The center terminal is for the neutral safety switch and the two outer terminals are for the back-up lights.
There is no adjustment for the switch. If a malfunction occurs, the switch must be removed and replaced.
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