928 S4 V8-4957cc 5.0L (1987)
b.
(-) to terminal 2 of control unit. Press switch 1 forward, switch 1 down, switch 3 toward rear sequentially.
Reading:
Battery voltage in each case.
c.
(-) to terminal 3 of control unit. Press switch 3 forward, switch 3 toward rear sequentially.
Reading:
Battery voltage in each case.
d.
(-) to terminal 4 of control unit. Press switch 1 forward, switch 1 toward rear sequentially.
Reading:
Battery voltage in each case.
e.
(-) to terminal 5 of control unit. Press switch 1 up, switch 1 down sequentially, Reading: Battery voltage in each case.
If values are not reached check wiring.
If wiring is okay replace relay unit. Refer to terminal designation chart on page 3 of this bulletin for plug-relay unit application.
Checking Control Unit
18.
Remove cover of plug 15.
Leave plug connected.
Connect Voltmeter (-) to ground on 2 pole plug of adaptor cable and (+) to terminal 1 of plug 15.
Press position key 2 or 3 briefly.
Reading:
Battery voltage.
Connect Voltmeter to plus (+) on 2 pole plug of adaptor cable and terminal 3 of plug 15.
Reading:
Battery voltage
19.
Switch on lights.
Connect Voltmeter (-) to ground on 2 pole plug of adaptor cable and (+) to terminal 2 of plug 15.
Press position key 3 and move seat to position stored in memory.
Reading:
Approximately 1.8 V
20.
Connect Voltmeter (-) to ground on 2 pole plug of adaptor cable and (+) to terminal 4 of plug 15.
Press position key 2 and move seat to position stored in memory.
Reading:
approximately 1.8 V
21.
Connect Voltmeter (-) to ground on 2 pole plug of adaptor cable and (+) to terminal 5 of plug 15.
Press position key 1 and move seat to position stored in memory.
Reading:
approximately 1.8 V
Switch off lights.
If values are not reached check wiring. If wiring is okay replace control unit.
