928 S4 V8-4957cc 5.0L (1987)
19.
Connect Voltmeter (+) to terminal 2 and (-) to terminal 11.
Press position key 1.
Reading:
0.3-4.5 volts.
NOTE:
Voltage is applied for approximately 30 seconds after position keys are pressed.
20.
Set mirror selector switch to driver side mirror.
21.
Connect Voltmeter (+) to terminal 6 and (-) to terminal 13.
Push mirror adjuster switch up.
Reading:
approximate battery voltage.
22.
Connect Voltmeter (-) to terminal 6 and (+) to terminal 13.
Push mirror adjuster switch down.
Reading:
approximate battery voltage.
23.
Connect Voltmeter (-) to terminal 13 and (+) to terminal 14.
Push mirror selector switch to left.
Reading:
approximate battery voltage.
24.
Connect Voltmeter (+) to terminal 13 and (-) to terminal 14.
Push mirror adjuster switch to right.
Reading:
approximate battery voltage.
25.
Set mirror selector switch to passenger side mirror.
26.
Connect Voltmeter (-) to terminal 8 and (+) to terminal 10.
Push mirror adjuster switch up.
Reading:
approximate battery voltage.
Checking Mirror Control Unit (continued)
27.
Connect Voltmeter (+) to terminal 8 and (-) to terminal 10.
Push mirror adjuster switch down.
Reading:
approximate battery voltage.
28.
Connect Voltmeter (-) to terminal 8 and (+) to terminal 12.
Push mirror adjuster switch to left.
Reading:
approximate battery voltage.
29.
Connect Voltmeter (+) to terminal 8 and (-) to terminal 12.
Push mirror adjuster switch to right.
Reading:
approximate battery voltage.
If values are not reached, check wiring.
If wiring is okay, replace mirror control unit. Reinstall plug cover.