Vanden Plas (X300) L6-4.0L (AJ16) (1996)
Power Seat Motor: Pinpoint Tests
1.
Seat power supply
a. Check fuses F3, F4, F9 and F12 in RH and fuse F6 in LH heelboard fuse boxes are intact. If blown determine reason for failure and renew.
b. Unplug harness connector from SCM and check for battery supply voltage to ground, at pins 4, 6, 7 & 12 (B1 connector) and pin 11 (B2
connector) with ignition on. If supply is not recorded on all pins switch off ignition and check harness wiring continuity from heelboard
fuse boxes to faulty lines as follows:
Connector B1
Pin 4 - fuse F 3, RH fuse box
Pin 6 - fuse F 4, RH fuse box
Pin 7 - fuse F 6, LH fuse box
Pin 12 - fuse F9, RH fuse box
Connector B2
Pin 11-fuse F12, RH fuse box
SCM Power Supplies
2A.
Seat movement motors (memory seals)
a. Check motor operation is not obstructed, and that mechanical linkage is not damaged or disconnected.
b. Examine wiring harness, checking continuity between SCM Connector Al and motor unit connector pins as follows:
SCM
Motor Function
Unit Pin
Pin 8
Seat forward
1
Pin 7
Seat rearward
3
Pin 5
Seat rear raise
1
Pin 6
Seat rear lower
3
Pin 3
Seat front raise
1
Pin 4
Seat front lower
3
c. Check resistance between motor pins 1 and 3, a value of approximately 2 Ohm should be indicated.
d. Check motor position potentiometer as described in test 4.
2B.
Seat movement motor (manual seats)
a. Check motor operation is not obstructed, and that mechanical linkage is not damaged or disconnected.
b. Check continuity from motor connector pins (1 & 3) to each relay contact connector (pin 3, raise relay, pin 8, lower relay) respectively.
c. Check power supply (+12 V) from LH heelboard fuse box, fuse F6, to seat switch connector pin 9.
d. Check power supply (+12 V) from RH heelboard fuse box, fuse F3, to pin 5, raise relay connector and pin 10, lower relay connector.
e. Check continuity from switch pack connector pin 4 to raise relay connector pin 5 and from switch pack connector pin 5 to lower relay
connector pin 6
f.
Check continuity to ground from raise relay connector pins 2 and 4 and lower relay connector pins 7 and 9
3.
Seat squab/headrest motors
a. Check motor operation is not obstructed, and that mechanical linkage is not damaged or disconnected.