1988 PONTIAC FIERO Service Repair Manual

HATCH RELEASE 1:
(Continued from previous page) I
MATGH RELEASE TEST (TABLE 2)
Measure: VOLTAGE
At: HATCH RELEASE
SVVITCH CONNECTOR
[Connected)
-re I Correct I or I
Between I Voltage I Diagnosis I I
1 -a Release Switch De~ressed I
(ORN)
& Ground
HAKH RELEASE TEST (TABLE 3)
Measure: VOLTAGE
At: RELEASE RELAY CONNECTOR
(Disconnected)
Conditions:
0 Release Switch: DEPRESSED (hold)
r Parking Brake: APPLIED
a lanition Switch: LOCK
Battery (Continued from
previous column)
See 1
1. Checklrepair BLK/WHT (40) wire.
2. Checklrepair TAN/WHT (33) wire and
Parking Brake Switch (see schematic).
HATGH RELEASE TEST (TABLE 4)
Connect: FUSED JUMPER
At: RELEASE RELAY (Disconnected)
Condition:
a Hatch Release Switch: DEPRESSED
Jumper Correct For
Between Result Diagnosis
B (BLKIWHT) Hatch
& C (BLK) See 1 opens
e If
the result is correct, replace the
Hatch Release Relay.
1. Checklrepair BLK (142) wire.
CIRCUIT OPERATION
Voltage is applied at all times through the
CTSY Fuse to the Release Switch. With the
Parking Brake applied, or with, the Ignition
Switch in
OFF, depressing the Release Switch
will cause current to flow through the Release
Relay coil. The relay operates and voltage is
applied to the Release Solenoid. The Solenoid
operates and the Hatch opens.
(Continued in next column)

HATCH PULL-DOWN Q) B
I
4
KEYLOCK
0 I
I !

HATCH PULL-DOWN
TROUBLESHOOTING H lNTS
Try the following checks before doing the
System Check.
1. Check that connector on Hatch Pull-Down
Unit is firmly seated.
2. Check Hatch Fuse by visual inspection.
* Go to System Check for a guide to normal
operation.
, * Go to System Diagnosis for diagnostic tests.
SYSTEM CHECK
Use the System Check Table as a guide to
normal operation;
Refer
to'system Diagnosis for diagnostic
steps.
SYSTEM CHECK TABLE
Striker rises to
and raise the lid
Lower the Hatch Striker retracts
slowly until lock
pulling Hatch dosed
hook on Hatch
Caution: to avoid
latches the striker
injury keep fingers
and clothing away
from edge of Natch
while it is closing
COMPONENT LOCATION Page-Figure
Hatch Fuse
..................... Attached to side of Fuse Block
..... Hatch Pull-Down Unit ............ Center of end panel, in cargo compartment
201-17-B
C208 (8 cavities)
................. Behind LH side of rear seat. ................. 201-17-C
SYSTEM DIAGNOSIS
Do the test below if the Hatch Pull-Down
Unit does not operate
At: HATCH
PULL-DOVVN UNIT (Connected)
I I
If voltages are correct but Hatch Pull-
Down Unit does not operate, replace Pull-
Down
Unit. (See Body Section 7 for dis-
assembly procedures).
1. Check REDIWHT (138) wire and Hatch
Fuse for an open.
Closing When the Hatch is lowered, the lock hook
latches the Striker, moving the Pull-Down Unit
Latch contacts to the LATCHED position. Voltage
is then applied to the motor in the reverse
disec-
tion. The motor moves the Striker down, pulling
the Hatch closed. Once the Natch is closed, the
Pull-Down Unit Striker contacts move to the
STRIKER FULLY PULLED DOWN position re-
moving the ground from the motor.
CIRCUIT OPERATION
Opening
When the Hatch is closed, the Latch contacts
and Striker contacts are
in the position shown
on the schematic. Voltage is applied at
all times
to the Hatch Pull-Down Unit through the
Hatch Fuse and the REDIWHT (138) wire.
When the Hatch is opened, the Latch contacts
are moved from the LATCHED to the
UNLATCHED position. The motor in the
Hatch Pull-Down Unit is then grounded
through the UNLATCHED path of the Latch
contacts.
The motor drives the Striker upward to pre-
pare for closing. When the Striker reaches the
fully extended position, the Striker contacts
move to the STRIKER FULLY EXTENDED
position removing battery voltage from the
motor.

- POWER MIRRORS / f

POWER MIRRORS
TROUBLESHOOTING HINTS
e Try the following check before doing the Sys-
tem Check.
Check the CTSY Fuse by checking for opera-
tion of the
LH courtesy light.
a Go to System Check for a guide to normal
operation.
e Go to System Diagnosis for diagnostic tests.
SYSTEM CHECK
0 Use the System Check Table as a guide to
normal operation.
e Refer to System Diagnosis for a list of symp-
toms and diagnostic steps.
SYSTEM CHECK TABLE
the left and right
(Continued in next column)
COMPONENT LOCATION Page-Figure
..................... Fuse Block. Behind
LN side of IIP, below light switch. ...... 201-10-A
C238 (12
cavities) ................ LH shroud, ahead of center access hole. ........ 201-11-C
................. C303 (4 cavities) LN
shroud, near center access hole
C304 (4 cavities) ................. RH shroud, near center access hole
.......................... 6321 In center console, below switches
.......................... S203. I/P harness, behind instrument cluster. ........ 201-10-A
S221. .......................... Mirror harness, LN shroud at center access hole
S222. .......................... Mirror harness, LN shroud at center access hole
(Continued from
~revious column)
Put the Mirror
Select Switch in the R
position and operate the Mirror Control
Switch in the UP and
DOWN
Dositions
RN Outside Mirror
moves smoothly
upward and downward
perate the Mirror RH Outside Mirror
osition Switch in the moves
smoothly to the
LEFT and RIGHT
e Refer to System Diagnosis when a result is
not normal.
SYSTEM DIAGNOSIS
a Diagnostic steps for the symptoms listed in
the following table are listed after the table.
SYMPTOM TABLE
B: LW mirror does not operate in one or
C:
RH mirror does not operate in one or
A: BOTH MIRRORS DO NOT OPERATE
IN
ANY MODE
(A: BOTH MIRRORS DO NOT OPERATE IN
ANY MODE continued on next page)

POWER MIRRORS
(A: BOTH MIRRORS DO NOT OPERATE IN
ANY MODE continued from previous page)
Outside Mirror Switch.
1. Check ORN (40) wire.
B: LH MIRROR DOES NOT OPERATE IN
ONE OR MORE MODE
Measure: VOLTAGE
At: OUTSIDE
MIRROR SWTlCH
CONNECTOR (Connected)
Conditions:
Mirror Select Switch:
L
* Mold Mirror Position Switch in UP or
I DOWN position
Measure Correct
I For Diagnosis 1 Between Voltage
I Battery I See l I (LT GRN)
Hold Mirror Position Switch in the Left or
Right position.
See
1
@ If both voltages are correct, replace the
LH Outside Mirror Drive Unit, after
checking connector C303, the YEL (881,
LT GRN (89), LT BLU (82) and WHT (81)
wires.
1. Replace Outside Mirror Switch.
6: RH MlRROR DOES NOT OPERATE
IN ONE OR MORE
MODE
At: OUTSIDE MIRROR SWITCH
CONNECTCIR (Connected)
Mirror Select Switch:
R
Hold Mirror Position Switch in UP or
1 * Wold Mirror Position Switch in the Left 1
I or Right position. I
If both voltages are correct, replace the
RN Outside Mirror Drive Unit, after
checking connector
C304 and the YEL
(88), LT GRN/BLK (89), and LT BLU
(82) wires.
1. Redace Outside Mirror Switch.
CIRCUIT OPERATION
Each Outside Mirror has two reversible
Motors: one to adjust the mirror view up and
down, the other to adjust the mirror view
Right and Left. The driver operates four
Switches that control the polarity of the volt-
age to the Motors. The Mirror Select Switch
directs these control voltages to either the RH
or LH Outside Mirror. With the
Switches in the positions shown in
the schematic, the LH Outside Mirror is
moved. When the Mirror Position Switch is
moved to the UP position, battery voltage
from the ORN wire is applied to the
YEL or
YEL/BLK wire and the Up-Down Motor in
each Outside Mirror. The LN Outside Mirror
Up-Down Motor, has a path to ground through
the LT GRN wire, the Up contacts of the Mir-
ror Position Switch, and the BLK wire. The
LH Up-Down Motor runs and turns the mir-
ror up.
If the Mirror Switch Position is pushed to
the DOWN position, the same Motor receives
voltage. Now the polarity is reversed, with the
YEL or
YEL/BLK wires grounded. The
Motor runs in the opposite direction.
The RH Left-Right Motor operates in a
similar manner when the Mirror Position
Switch is moved to the LEFT position. The
WHT wire gets battery voltage and the LT
BLU wire is grounded through the Mirror
Position Switch. If the Mirror Position Switch
is pushed to the RIGHT position, the polarity
is reversed and the motor will run in the op-
posite direction. The RH Outside Mirror works in the same
way as the LH Outside Mirror when the Mir-
ror Select Switch is moved to the R position
and the Mirror Position Switch is operated.