Testing Time Control Unit
NOTE:
The Time Control Unit (TCU) operates many different systems. The following circuit test procedures only check circuits that control the 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 .
- TCU is located behind driver's side kick panel. Ensure ignition key is in correct position when testing each circuit. Perform tests in order: power circuit, TCU output wiper relay circuit, wiper switch circuit, intermittent wiper volume, and washer switch circuit.
WIPER TIME CONTROL UNIT TESTS
| Symptom | Affected Circuit |
|---|---|
| No Power at Connector | Power Circuit |
| Intermittent Wiper Inoperative | TCU Output Wiper Relay |
| Intermittent Wiper Inoperative | Wiper Switch |
| Intermittent Time Not Adjustable | Intermittent Wiper Speed |
| Wiper/Washer Do Not Operate Together | Washer Switch |