928 S4 V8-4957cc 5.0L (1987)
4.
Set mirror selector switch to driver side mirror.
5.
Connect Voltmeter (+) to terminal 1 and (-) to terminal 2 of plug receptacle.
Push mirror adjuster switch to left.
Reading:
Battery voltage.
Connect Voltmeter (-) to terminal 1 and (+) to terminal 2.
Push mirror adjuster switch to right.
Reading:
Battery voltage.
6.
Connect Voltmeter (+) to terminal 5 and (-) to terminal 2.
Push mirror adjuster switch up.
Reading:
Battery voltage.
Connect Voltmeter (-) to terminal 5 and (+) to terminal 2.
Push mirror adjuster switch down.
Reading:
Battery voltage.
7.
Set mirror selector switch to passenger side mirror.
8.
Connect Voltmeter (+) to terminal 3 and (-) to terminal 2.
Push mirror adjuster switch to left.
Reading:
Battery voltage.
Connect Voltmeter (-) to terminal 3 and (+) to terminal 2.
Push mirror adjuster switch to right.
Reading:
Battery voltage.
9.
Connect Voltmeter (+) to terminal 4 and (-) to terminal 2.
Push mirror adjuster switch up.
Reading:
Battery voltage.
Connect Voltmeter (-) to terminal 4 and (+) to terminal 2.
Push mirror adjuster switch down.
Reading:
Battery voltage.
If values are not reached, check wiring and mirror selector and adjuster switches.
Reconnect plug 1.
Checking Memory Switch and Power Supply
10.
Disconnect plug 2 from mirror control unit.
Disconnect plug 9 from seat memory control unit.
Connect ohmmeter to ground and terminal 1 of plug receptacle.
Press position key 1.