Time Control Unit: Notes
NOTE:
The Time Control Unit (TCU) operates several different systems. The following circuit test procedures only check circuits that control intermittent wiper and washer operation.
- When testing time control unit, insert probes into harness side of connector while still plugged into control unit. See Fig 1.CAUTION: Ensure ignition key is in correct position when testing each circuit.
- TCU is located behind center console. Perform tests in order:
- POWER & GROUND CIRCUITS
- TCU OUTPUT WIPER RELAY CIRCUIT
- INTERMITTENT WIPER CIRCUIT
- INTERMITTENT WIPER SPEED CIRCUIT
- WIPER/WASHER CIRCUIT.
See WIPER TIME CONTROL UNIT TESTS table.
WIPER TIME CONTROL UNIT TESTS
| Symptom | Affected Circuit |
|---|---|
| No Power At Connector | Power & Ground Circuits |
| Intermittent Wiper Inoperative | TCU Output Wiper Relay |
| Intermittent Wiper Inoperative | Intermittent Wiper Switch |
| Intermittent Time Not Adjustable | Intermittent Wiper Speed |
| Wiper/Washer Do Not Operate Together | Washer Switch |
NOTE:
Perform tests with TCU connector connected. See illustration to identify TCU connector terminals. See Fig 1. If circuits do not test as specified, inspect TCU harness and repair or replace as required.