Blower Motor Inoperative at any speed <<CJ2>>
Step
| Action
| Value(s)
| Yes
| No
|
DEFINITION: Blower motor is inoperative at any selected
speed.
|
1
| Were you sent here from the HVAC
System Check (CJ2)?
| --
|
Go to Step 2
| Go to
HVAC System Check
|
2
|
- Disconnect the blower motor control module connector.
- Connect a DMM between terminal B of the blower motor control module
connector and ground.
- Measure the available voltage at terminal B of the blower motor
control module connector.
Is the voltage within the specified values?
| 10.0-14.0V
|
Go to Step 4
|
Go to Step 3
|
3
| Check the BLO MOT MaxiFuse® #49 for an open circuit.
Is the fuse open?
| --
|
Go to Step 23
|
Go to Step 24
|
4
|
- Connect the DMM between terminal A of the blower motor control
module connector and ground.
- Check CKT 150 for continuity to ground.
Is the resistance to ground less than the specified value?
| 0.5ohms
|
Go to Step 6
|
Go to Step 5
|
5
| Locate and repair an open or a
high resistance in CKT 150 between the blower motor control module connector
and G202.
Is the repair complete?
| --
| Go to
HVAC System Check
| --
|
6
|
- Disconnect the HVAC Control Assembly connector.
- Connect a DMM between terminal C of the blower motor control module
connector and terminal C11 of the HVAC Control Assembly connector.
- Check CKT 63 for continuity between these two connectors.
Is the resistance between terminal C of the blower motor control module
connector and terminal C11 of the HVAC Control Assembly connector less than
the specified value?
| 0.5ohms
|
Go to Step 8
|
Go to Step 7
|
7
| Locate
and repair an open or a high resistance in CKT 63.
Is the repair complete?
| --
| Go to
HVAC System Check
| --
|
8
|
- Connect the DMM between terminal C11 of the HVAC Control Assembly
connector and ground.
- Check CKT 63 for continuity to ground.
Is CKT 63 shorted to ground?
| --
|
Go to Step 9
|
Go to Step 10
|
9
| Locate
and repair a short to ground in CKT 63.
Is the repair complete?
| --
| Go to
HVAC System Check
| --
|
10
|
- Disconnect the blower motor connector.
- Visually inspect the 2-wire (PURPLE and BLACK) jumper harness
for damage.
- Using a DMM, check the PURPLE and BLACK wires for continuity between
the blower motor connector and the blower motor control module connector.
Is the 2-wire (PURPLE and BLACK) jumper harness in proper working condition?
| --
|
Go to Step
12
|
Go to Step
11
|
11
| Repair the 2-wire
(PURPLE and BLACK) jumper harness as needed.
Is the repair complete?
| --
| Go to
HVAC System Check
| --
|
12
|
- Connect a fused jumper wire between the blower motor control module
connector terminal B and the blower motor terminal B.
- Connect a fused jumper wire between the blower motor control module
connector terminal A and the blower motor terminal A.
Does the blower motor operate normally?
| --
|
Go to Step 14
|
Go to Step 13
|
13
| Replace the blower motor. Refer to
Blower Motor and Fan Replacement
.
Is the repair complete?
| --
| Go to
HVAC System Check
| --
|
14
|
- Reconnect all of the components back to their respective connectors.
- Connect the scan tool to the diagnostic link connector.
- Turn the ignition switch to the ON position.
- Select HVAC readout parameters on the scan tool.
- Depress the blower motor control button until the MAX blower position
is reached.
- Depress the blower motor control button until the MIN blower position
is reached.
Does the scan tool read the appropriate blower motor speed?
| --
|
Go to Step 15
|
Go to Step 16
|
15
| Replace the blower motor control
module . Refer to
Blower Motor Control Module Replacement
.
Is the repair complete?
| --
| Go to
HVAC System Check
| --
|
16
|
- Turn the ignition switch to the OFF position.
- Remove the scan tool from the diagnostic link connector.
- Disconnect the HVAC Control Assembly connector.
- Connect a DMM between terminal C12 of the HVAC Control Assembly
connector and ground.
- Measure the available voltage at terminal C12 of the HVAC Control
Assembly connector.
Is the voltage within the specified values?
| 10.0-14.0V
|
Go to Step 18
|
Go to Step 17
|
17
| Locate and repair an open or high resistance in CKT 540.
Is the repair complete?
| --
| Go to HVAC System Check (CJ2)
| --
|
18
|
- Connect a DMM between terminal C5 of the HVAC Control Assembly
connector and ground.
- Turn the ignition switch to the ON position.
- Measure the available voltage at terminal C5 of the HVAC Control
Assembly connector.
Is the voltage within the specified values?
| 10.0-14.0V
|
Go to Step 20
|
Go to Step 19
|
19
| Locate and repair an open or high resistance in CKT 41.
Is the repair complete?
| --
| Go to
HVAC System Check
| --
|
20
|
- Disconnect the HVAC Control Assembly connector.
- Connect a DMM between terminal C1 of the HVAC Control Assembly
connector and ground.
- Measure CKT 150 for continuity to ground.
Is the resistance to ground less than the specified value?
| 0.5ohms
|
Go to Step 22
|
Go to Step 21
|
21
| Locate and repair an open or high
resistance in CKT 150.
Is the repair complete?
| --
| Go to
HVAC System Check
| --
|
22
| Replace the HVAC Control Assembly. Refer to
Control Assembly Replacement
.
Is the repair complete?
| --
| Go to
HVAC System Check
| --
|
23
|
- Disconnect the blower motor control module connector.
- Disconnect the blower motor connector.
- Replace the BLO MOT MaxiFuse® #49.
Does the BLO MOT MaxiFuse® #49 open immediately when installed?
| --
|
Go to Step
25
|
Go to Step
26
|
24
| Locate and repair
an open or a high resistance in CKT 1342.
Is the repair complete?
| --
| Go to
HVAC System Check
| --
|
25
| Locate and repair a short to ground in CKT 1342.
Is the repair complete?
| --
| Go to
HVAC System Check
| --
|
26
|
- Reconnect the blower motor control module connector.
- Blower motor connector still disconnected.
- Replace the BLO MOT MaxiFuse® #49.
- Turn the ignition switch to the ON position.
- Press the HVAC mode button until FLOOR is displayed.
- Press the fan control button until high speed is displayed.
Does the BLO MOT MaxiFuse® #49 open with the blower motor control
module connected?
| --
|
Go to Step 15
|
Go to Step 13
|
