Manual Switch Circuit
- Turn ignition off. Remove tilt and telescopic ECU with wiring harness connector attached. Using a voltmeter, measure voltage by backprobing rear of 18-pin ECU connector T10 between terminals No. 17 (Red/White wire) and No. 16 (Violet wire). See Figure. Operate manual switch in each position and note voltage reading. See MANUAL SWITCH CIRCUIT VOLTAGE table. If voltage is not as specified, go to next step. If voltage is as specified, go to next test listed in SYMPTOM DIAGNOSIS table under TROUBLE SHOOTING.MANUAL SWITCH CIRCUIT VOLTAGE
Switch Position Voltage Telescopic Extend 2.05-2.75 Telescopic Retract .65-.95 Tilt Down .30-.50 Tilt Up 1.30-1.70 - Disconnect 18-pin tilt and power telescopic unit (combination switch) connector. Using an ohmmeter, measure resistance between tilt and power telescopic unit (combination switch) connector terminals No. 4 (Red/White wire) and No. 6 (Violet wire). See Fig 1. Operate manual switch in each position and note resistance reading. See MANUAL SWITCH RESISTANCE table. If resistance is as specified, go to next step. If resistance is not as specified, replace tilt and power telescopic unit (combination switch) and retest system operation.MANUAL SWITCH RESISTANCE
Switch Position Ohms Telescopic Extend 160 Telescopic Retract 790 Tilt Down 1,990 Tilt Up 360 - Check wiring harness and connectors between tilt and telescopic ECU and tilt and power telescopic unit (combination switch). See WIRING DIAGRAMS . Repair or replace as necessary. If wiring harness and connectors are okay, check tilt and telescopic ECU. See TILT & TELESCOPIC ECU PIN VOLTAGE TESTS under COMPONENT TESTS. Replace tilt and telescopic ECU as necessary and retest system operation.