Pontiac Fiero 1988 Service Manual page 1051

AIR CONDITIONING: B L O W E R C O N T R O L S
C60, MANUAL
(Continued from previous page)
Measure
Between
Correct
Voltage
For Diagnosis
CI (PPL) &
Ground
Battery
Seel
CI (PPL) & C2
(BLK)
Battery See 2
• If the voltages are correct but the blower
does not run, install a new Blower Motor.
1. Check the PPL (65) wire for an open. If
wire is good, do Test B and Test D.
2. Check the BLK (150) wire for an open and
that ground G201 is clean and tight.
B: HIGH SPEED BLOWER RELAY TEST
(TABLE 1)
Measure: VOLTAGE
At: HIGH SPEED BLOWER RELAY
CONNECTOR (Disconnected)
Conditions:
© Ignition Switch: RUN
• A/C Mode: VENT
• Blower Switch: HI
Measure
Between
Correct
Voltage
For Diagnosis
D (RED) &
Ground
Battery Seel
A (ORN) &
Ground
Battery See 2
• If voltages are correct, proceed to Table 2.
1. Check RED (2) wire for an open back to
Fusible Link A.
2. Check ORN (52) wire for an open. If wire is
good, do Test D.
B: HIGH SPEED BLOWER RELAY TEST
(TABLE 2)
Measure: RESISTANCE
At: HIGH SPEED BLOWER RELAY
CONNECTOR (Disconnected)
Conditions:
• Ignition Switch: OFF
• Negative Battery
Terminal:
DISCONNECTED
Measure
Between
C (BLK) &
Ground
B (PPL) &
Ground
Correct
Resistance
0 ohms
Less than 3
ohms
For Diagnosis
Seel
See 2
• If voltages in Table 1 and resistances in
Table 2 are correct, but Blower Relay does
not operate, replace the Blower Relay.
1. Check the BLK (150) wire for an open.
2. Check the PPL (65) wire for an open. If
wire is good, recheck measurements made
in Test A.
C: BLOWER RESISTORS TEST
Measure: RESISTANCE
At: BLOWER RESISTORS (Disconnected)
Condition:
• Ignition Switch: OFF
Measure
Between
Correct
Resistance
For Diagnosis
A& C 1.5 ± .5 ohm Seel
C & D 0.7±.5 ohm Seel
D & B 0.2 ± .lohm See 1
(Continued in next column)
(Continued from previous column)
If resistances are correct, Blower Resistors
are operating normally. If Blower does not
operate in LO, Ml or M2, but does operate
in HI, check for an open in the PPL (65)
wire between Blower Resistors Terminal B
and S107.
Install new Blower Resistors.
D: BLOWER SWITCH T E S T (TABLE 1)
Measure: VOLTAGE
At: BLOWER RESISTORS CONNECTOR
(Disconnected)
Conditions:
• Ignition Switch: RUN
• A/C Mode: VENT
© Blower Switch: LO
Measure
Between
Correct
Voltage
For Diagnosis
A (LT GRN) &
Ground
Battery See 1 & 5
C (TAN) &
Ground
0 Volts See 2
• Blower Switch: Ml
C (TAN) &
Ground
Battery See 3 & 5
D (LT BLU) &
Ground
0 Volts See 2
• Blower Switch: M2
D (LT BLU) &
Ground
Battery See4&5
(Continued on next page)