Pontiac Fiero 1988 Service Manual page 1041

HEATER: C41
(Continued from previous page)
A : B L O W E R S W I T C H T E S T
Measure: VOLTAGE
At: BLOWER SWITCH
CONNECTOR
{Connected)
Condition:
^ ignition Switch: RUN
Measure
Between
Correct
Voltage
For Diagnosis
E (BRN) &
Ground
Battery
Seel
• Blower Switch: LO
C (YEL) &
Ground
Battery See
2
• Blower Switch: MED
D (LT BLU) &
Ground
Battery See
2
• Blower Switch: HI
B (ORN) &
Ground
Battery See
2
• If all results are correct, perform Test B:
Blower Resistors Test.
1. Check/repair BRN (50) wire for an open
(see schematic).
2. Replace Blower Switch.
B: B L O W E R R E S I S T O R S T E S T
Measure: VOLTAGE
At: BLOWER RESISTORS CONNECTOR
(Disconnected)
Conditions:
© ignition
Switch: RUN
© Blower Switch: LO
Measure
Between
Correct
Voltage
For Diagnosis
C (YEL) &
Ground
Battery Seel
© Blower Switch: MED
A (LT BLU) &
Ground
Battery See
2
© Blower Switch: HI
B
(PPL) &
Ground
Battery See
3
• If all voltages are correct, replace the
Blower Resistors.
1. Check YEL (51) wire for
schematic).
an open (see
2. Check LT BLU (72) wire for an open (see
schematic).
3. Check PPL (65) wire for an open (see sche-
matic).
C : BLOWER MOTOR T E S T
Measure:
VOLTAGE
At: BLOWER MOTOR CONNECTOR
(Disconnected)
Conditions:
® Ignition Switch: RUN
© Blower Switch: Hi
Measure
Between
Correct Voltage For Diagnosis
PPL (65) wire
& Ground
Battery Seel
PPL (65) wire
& BLK (150)
wire
Battery
See 2
® If all results are correct, rep]
Motor.
ace the Blower
1. Check PPL (65) wire for an open. If wire is
OK, perform Test A: Blower Switch Test.
2. Check BLK (150) wire for an open (see sche-
matic).
D: HIGH S P E E D B L O W E R R E L A Y T E S T
(TABLE 1)
Measure: VOLTAGE
At:
HIGH SPEED
BLOWER RELAY
CONNECTOR (Disconnected)
Conditions:
• Ignition Switch: RUN
o
[BBower Switch:
E H I Q
Measure
Between
Correct
Voltage
For Diagnosis
D (RED) &
Ground
Battery Seel
1
!
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2
m
3D
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