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Replacing Dynamic Oil Pressure Warning System Control Unit (1985 through 1989 models)

Troubleshooting for the oil pressure warning system is covered in ENGINE. If you suspect a problem with the warning system, first be certain that engine oil pressure is OK. If testing reveals a problem, check that the oil pressure switches are functioning properly and that the switch wiring and connections are OK before assuming that the control unit is at fault.

NOTE -

When first switching the ignition on, an impulse from the ignition system may briefly set off the low pressure warning buzzer. This condition is normal and does not indicate a fault.

The oil pressure warning control unit is mounted behind the speedometer. For access to the control unit, first remove the instrument cluster as described in BODY AND INTERIOR.

To replace a faulty control unit first remove the instrument illumination bulbs and the voltage stabilizer, then remove the flexible printed circuit from the instrument cluster. See Fig. 7-1.

Remove the speedometer from the cluster. Then release the locking tabs to lift the control unit printed circuit away as shown in Fig. 7-8. Install the new control unit printed circuit, press in the locking tabs, and reassemble and install the instrument cluster.

Fig. 7-8. Oil pressure warning system printed circuit being removed. Disengage tabs 1 and pull printed circuit in direction A until contacts project, then slide off in direction B.

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