PONTIAC FIERO 1988 Service Repair Manual

AUTOMATIC DAY-NIGHT MIRROR
(Continued from previous page)
SYSTEM DIAGNOSIS
0 Do the tests below if the Automatic Day-Night
Mirror does not operate correctly.
AUTOMATIC DAY-NIGHT MIRROR
VOLTAGE TEST
CONNECTOR (Disconnected)
1. Check BLK and LT GRN (24) wires for an
open. If Back Up lights do not operate,
check Gear Selector Switch adjustment
(automatic) or Back Up Switch
adjust-
:Continued from previous column)
2. Check Gear Selector Switch adjustment
(automatic) or Back Up Switch adjust-
ment (manual). Replace suspect switch if
adjustment does not correct the problem.
3. Check BLK and RED (39) wire for an
open.
4. Check BLK (150) wire for an open.
CIRCUIT OPERATION
The Automatic Day-Night Mirror is auto-
matically moved to the DAY and NIGHT posi-
tions as light conditions change. The Headlight
and Ambient Sensors read the light conditions
and feed this information to the solid state
mir-
ror control unit. The control unit activates the
Motor that drives the mirror.
With the Gear Selector
in Reverse, battery
voltage is applied through the Gear Selector
Switch or Back Up Switch to the reset input of
the mirror. If the mirror is in the NIGHT posi-
tion,
it changes to the DAY position. This pro-
vides a clear view for backing the car.
A distance or sensitivity control changes the
brightness required from the headlights of the
car behind to cause the
mirror to shift to the
NIGHT position.

LUMBAR AND BOLSTER SUPPORT I
DEFOGGER
r:
PASSENGER'S
LUMBAR
CONTROL
SWITCH

LUMBAR AND BOLSTER SUPPORT
TROUBLESHOOTING HINTS
@ Try the follovving checks before doing the
System Check.
1. Check the In-Line Fuse.
2. Check the PWR ACC Circuit Breaker.
COMPONENT LOCATION
Fuse Block. ..................... Behind LN side of IIP, below light switch.
In-Line Fuse Holder
.............. Taped to 6331, below LR front seat
Lumbar
PumpIMotor ............. Underside of LN front side
Lumbar
PumpIMotor Relay. ....... Underside of LN front seat Page-Figure
201-10-A
3. If the Lumbar
PumpIMotor runs, but both
Lumbar Valve Assembly .......... Underside of respective front seat
driver's and passenger's Lumbar and Bolster
C238 (12 cavities) ................ LN shroud, ahead of center access hole. ........ 201-11-C
Supports do not operate, check the
contin& C330 (2 cavities) ................. Underside of LM front seat
to ground of
BLKIWNT (769) wire (see C331(4 cavities) ................. Underside of LN front seat
schematic). C332 (4 cavities)
................. Underside of RH front seat
.......................... 4. Check the hose between the Valve Assemblies 6216
At
LH shroud
.......................... ............... and the PumpIMotor for leaks or cracks. S233. IIP harness, above Fuse Block. 201-10-A
.......................... r Go to System Check for a guide to normal S331. Lumbar harness, below LR front seat
.......................... operation. S332. Lumbar harness, below LR front seat
S333. .......................... Lumbar harness, below LH front seat r Go to System Diagnosis for diagnostic tests. S334. .......................... Lumbar harness, below LN front seat
SYSTEM CHECK
Use the System Check Table as a guide to SYSTEM CHECK TABLE (Continued from previous col
normal operation. Driver's Lumbar
Control Switch:
LUMBAR and
DEFLATE
Repeat the above
settings using the
Passenger's Lumbar
Control Switch and
note the operation of
the passenger's seat
@ Refer to System Diagnosis when a result is
not normal.
The Lumbar Support
on the driver's seat
deflates
The supports in the
passenger's seat
operate the same as
the driver's seat
supports SET CONTROLS
Driver's Lumbar
Control Switch:
BOLSTER and
INFLATE
Driver's Lumbar
Control Switch:
LUMBAR and
INFLATE
Driver's Lumbar
Control Switch:
BOLSTER and
DEFLATE
(Continued in next column)
NORMAL OPERATION
The Bolster Support
on the driver's seat
inflates
The Lumbar Support
on the driver's seat
inflates
The Bolster Support
on the driver's seat
deflates

LUMBAR AND BOLSTER SUPPORT
SYSTEM DIAGNOSIS A: LUMBAR CONTROL PUMPIMCITOR A: LUMBAR CONTROL PUMPIMOTOR
At: LUMBAR PUMPIMOTOR RELAY
CONNECTOR (Disconnected)
Driver's Lumbar Control Switch:
0 Driver's Lumbar Control Switch: INFLAT
0 If voltages are correct, go to Table 2.
1. Check ORNIBLK (60) wire for an open (see
schematic).
2. Check BLK (150) wire for an open (see
schematic).
3. Check GRY (764) wire for an open (see
schematic).
4. Check WHT (766) wire for an open (see
schematic).
e Do the tests listed for your symptom in the RELAY TEST (TABLE 1)
Symptom Table.
e Tests follow the Symptom Table.
SYMPTOM TABLE
SYMPTOM
Neither Lumbar
Control causes the
supports to inflate or
deflate
Lumbar and/or
Bolster Supports do
not operate in the
driver's seat only
Lumbar
and/or
Bolster Supports do
not operate in the
passenger's seat only
RELAY TEST (TABLE 2)
DO TEST
A: Lumbar Control
PumpIMotor Relay
Test
B: Lumbar Control
Switch Test
B: Lumbar Control
Switch Test
(Continued on next page)
Connect: FUSED JUMPER
At: LUMBAR
PUMPIMOTOR RELAY
CONNECTOR (Disconnected)
Condition:
e Driver's Lumbar Control Switch:
LUMBAR
For
Diagnosis
See 1
See 1
Jumper
Between
C (ORNI
BLK)& E
(PNK) and B
(ORN) & D
(BLK)
C (ORNIBLK)
& B (ORN) and
E (PNK) & D
(BLK)
0 If results are correct, replace the Lumbar
PumpIMotor Relay.
1. Check ORN (767) and PNK (768) wires and
connectors for continuity. If the connections
and wires are good, replace the Lumbar
PumpIMotor.
Correct
Result
Driver's
Lumbar Support inflates
Driver's
Lumbar Support deflates

LUMBAR AND BOLSTER SUPPORT
(Continued from previous page)
B: LUMBAR CONTROL SWITCH TEST
Measure: VOLTAGE
At: DRIVER'S OR PASSENGER'S LUMBAR
CONTROL
SWITCH (Connected)
Condition:
Lumbar Control
Svvitch: LUMBAR &
INFLATE
I (ORNIBLK) I ~attery ( See 1 ( & Ground
Measure
Belween
1 & 1 Battery I See 2 I
Correct
Voltage
(BRN) &
Ground
I
Lumbar Control Switch: BOLSTER &
DEFLATE
For
Diagnosis
I A(PPL) & I Battery I See 2 I Ground Battery
Ground
I I Battery I See 2 1
See 2
If voltages are correct, do Test C.
1. Check In-Line Fuse and ORNIBLK (60)
wire for an open.
2. Check In-Line Fuse. If blown, check
attached wire for a short to ground. Oth-
erwise, replace Lumbar Control Switch.
6: LUMBAR VALVE ASSEMBLY TEST CIRCUIT OPERATION
Voltage is applied at all times though the
PWR ACC Circuit Breaker. When the Lmbar
Control Switch is moved to LUMBAR and
INFLATE, the Lumbar PunapIMotor starts to
operate to pump up the Lumbar Support. When
the Lumbar Control Switch is moved to
DEFLATE, the
Lumbar Pump Motor reverses
to pull the
air from the Lumbar Support.
Bolster Support operates
in the same manner.
SSENGER'S LUMBAR
VALVE ASSEMBLY CONNECTOR
(Disconnected)
If voltages are correct, replace the suspect
Lumbar Valve Assembly.
1. Check BRN (763) wire for an open.