Manual Switch Circuit

Remove tilt and telescopic control module and leave harness connectors connected. Measure voltage between tilt and telescopic control module connector T10, terminals No. 16 and No. 17. See Figure. Operate manual switch in each position and note voltage reading. See MANUAL SWITCH OPERATION PIN VOLTAGE table. If voltages are as specified, go to TROUBLE SHOOTING and identify next circuit to be checked. If voltages are not as specified, go to next step.

MANUAL SWITCH OPERATION PIN VOLTAGE

Switch Position

⁽¹⁾ Voltage

Telescopic Retract

2.6

Tilt Up

3.5

Telescopic Extend

4.2

Tilt Down

4.6

⁽¹⁾	Approximate measured voltage.

Disconnect manual switch wiring harness connector. On SC300 models, measure resistance between manual switch connector terminals No. 4 and No. 6. On SC400 models, measure resistance between manual switch connector terminals No. 3 and No. 5. See Fig 1 and Fig 2. Operate manual switch in each position and note resistance. See MANUAL SWITCH RESISTANCE table. If resistances are as specified, go to next step. If resistances are not as specified, replace tilt and telescopic manual switch.

MANUAL SWITCH RESISTANCE

Switch Position	Ohms
Telescopic Extend	160
Tilt Up	360
Telescopic Retract	790
Tilt Down	1990

Fig 1: Testing Manual Switch (SC300 Models)

Fig 2: Testing Manual Switch (SC400 Models)

Check and repair wiring harness between tilt and telescopic control module and manual switch connector. See WIRING DIAGRAMS . If wiring harness is okay, replace tilt and telescopic control module and retest system.