Pontiac Fiero 1988 Service Manual page 1141

TRUNK R E L E A S E : A 9 0
(Continued from previous page)
T R U N K R E L E A S E T E S T (TABLE 1)
Measure:
VOLTAGE
At: TRUNK
RELEASE
SOLENOID
CONNECTOR (Disconnected)
Conditions:
• Parking
Brake:
APPLIED (Manual
Transaxle)
• Gear: PARK (Automatic
Transaxle)
Measure
Between
Correct
Voltage
For Diagnosis
BLK/WHT &
Ground
0 Volts Seel
• Trunk Release button pressed
BLK/WHT &
Ground
Battery Seel
• If both voltages are correct, repair/
replace Trunk Rlease Solenoid.
1. Reconnect Solenoid and go to Table 2.
T R U N K R E L E A S E T E S T (TABLE 2)
Measure: VOLTAGE
At: TRUNK RELEASE SWITCH CONNECTOR
(Connected)
Measure
Between
Correct
Voltage
For Diagnosis
B (ORN/DK
BLU)&
Ground
Battery
Seel
• Trunk Release Switch: Depressed
A (GRY/BLK)
& Ground
Battery
See 2
• If both voltages are correct, go to Table 3.
1. Check/repair ORN/DK BLU (340) wire for
an open.
2. Replace the Trunk Release Switch.
TRUNK RELEASE TEST (TABLE 3)
Measure: VOLTAGE
At: TRUNK RELEASE RELAY CONNECTOR
(Disconnected)
Conditions:
• Trunk Release Switch: DEPRESSED
(hold)
• Parking Brake: APPLIED (Manual
Transaxle)
• Gear: PARK (Automatic Transaxle)
• Ignition Switch: LOCK
Measure
Between
B (GRY/BLK)
& Ground
B (GRY/BLK)
& A (see
schematic)
Correct
Voltage
Battery
Battery
For Diagnosis
Seel
See
2
• If both voltages are correct, go to Table 4.
1. Check/repair GRY/BLK (942) wire for an
open.
2. Check/repair YEL (5) (Automatic Trans-
axle) or TAN/WHT (33) (Manual Trans-
axle) wires.
TRUNK RELEASE TEST (TABLE 4)
Connect:
FUSED JUMPER
At: TRUNK RELEASE RELAY CONNECTOR
(Disconnected)
Condition:
• Trunk Release Switch: DEPRESSED
Jumper
Between
Correct Result For Diagnosis
B (GRY/BLK)
&C(BLK/
WHT)
Trunk
unlatches
Seel
(Continued in next column)
(Continued from previous column)
• If the result is correct, replace the Trunk
Release Relay.
1. Check/repair BLK/WHT (142) wire.
CIRCUIT OPERATION
Voltage is applied at all times through the
CTSY/LID Fuse to the Trunk Release Switch.
With the switch closed, voltage is applied
through the Trunk Release Switch to the Trunk
Release Relay coil and contact.
Manual Transaxle
When the Parking Brake is applied, the Park-
ing Brake Switch closes and provides ground
for the relay coil. The relay operates and voltage
is applied from the closed relay contact to the
Trunk Release Solenoid, releasing the lock.
Automatic Transaxle
Voltage is applied from the closed Trunk
Release Switch through the Trunk Release
Relay coil to the Gear Selector Switch. With the
Gear Selector Switch in PARK or NEUTRAL,
the Starter Solenoid provides ground for the
relay. The relay contacts close and voltage is
applied to the Trunk Release Solenoid, releas-
ing the lock.