GMC chevrolet camaro 2000 Service Manual page 218

HVAC HVAC Systems - Manual 1-121
Blower Motor Operates at High Speed Only
Step
Action Value(s)
Yes No
Did you complete the Diagnostic System Check? Go to A
1
-
Diagnostic
Go to Step 2 System Check
1. Place the ignition switch in the RUN position.
2. Place the selector switch in the VENT position.
2
3. Place the blower switch in position 1 (low).
-
4. Probe with a test lamp between the blower resistor
connector terminal C and ground.
Does the test lamp illuminate? Go to Step 3 Go to Step 4
Probe with a test lamp between the blower motor relay
3
connector terminal B2 and ground.
-
Does the test lamp illuminate? Go to Step 6 Go to Step B
Test for and repair a poor connection at the blower
4
resistor. Refer to Testing for Intermittent and Poor
-
Connections and Connector Repairs in Wiring Systems.
Did you find and repair a poor connection? Go to Step 9 Go to Step 5
Replace the blower resistor. Refer to Blower Motor
5
Resistor Replacement. -
-
Did you complete the replacement? Go to Step 9
Test for and. repair a poor connection at the blower motor
6
relay. Refer to Testing for Intermittent and Poor
-
Connections and Connector Repairs in Wiring Systems.
Did you find and repair a poor connection?
Go to Step 9 Go to Step 7
Replace the blower motor relay. Refer to Blower Motor
7
Relay Replacement.
-
-
Did you complete the replacement? Go to Step 9
Repair a poor connection or an open in the blower resistor
control circuit of the blower motor relay between the
8
blower resistor and the blower motor relay. Refer to
-
-
Connector Repairs or Wiring Repairs in Wiring Systems.
Did you complete the repair? Go to Step 9
9
Operate the system in order to verify the repair.
-
Did you correct the condition? System OK Go to Step 3
Blower Motor Inoperative in One Speed Only (High Speed Operates Normally)
Step Action Value(s) Yes No
Did you complete the Diagnostic System Check? Go to A
1
-
Diagnostic
Go to Step 2 System Check
1. Disconnect the blower resistor connector.
2. Place the ignition switch in the RUN position.
3. Place the blower switch in the inoperative position.
2
4. Connect a test lamp from the blower
-
resistor connector inoperative terminal
(position 1 (low) =B, 2 (M1) =A, 3 (M2} =D) to
ground on the harness connector.
Does the test lamp illuminate? Go to Step 3 Go to Step 5
Test for and repair a poor connection at the blower
3
resistor. Refer to Testing for Intermittent and Poor
-
Connections and Connector Repairs in Wiring Systems.
Did you find and repair a poor connection? Go to Step 9 Go to Step 4
Replace the blower resistor. Refer to Blower Motor
4
Resistor Replacement.
-
-
)
Did you complete the replacement? Go to Step 9
Probe with a test lamp between the HV AC control
5
(blower switch} connector C1 of the inoperative terminal
-
(position 1 (low) =A, 2 (M1) =C, 3 (M2) =D) and ground.
Does the test lamp illuminate? Go to Step 6 Go to Step 7