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Symptom:
*BLOWER RUNS AT ONLY ONE SPEED - ATC
CHECK CODE(S) PRESENT
AUTOMATIC TEMPERATURE CONTROL
BLOWER MOTOR CONTROL CIRCUIT SHORTED TO GROUND
BODY CONTROL MODULE
BLOWER POWER MODULE
TEST
1
Turn the ignition on.
With the DRBIII , record and erase Body Computer DTC's.
Cycle the ignition switch.
With the DRBIII , read the Body Computer DTCs.
Does the DRBIII display any DTCs?
Yes → Refer to the appropriate category for the related symptom(s).
→ Go To 2
No
2
Turn the ignition on.
With the DRBIII in Automatic Temperature Control, Monitor Display, PCI Bus Info
ATC, look for Fan Req To BCM.
Does the DRB display: Fan Req To BCM: Yes?
Yes → Go To 3
→ Replace the Automatic Temperature Control in accordance with
No
3
Turn the ignition off.
Disconnect the Blower Power Module C1 harness connector.
Disconnect the Body Control Module C1 harness connector.
Measure the resistance between ground and the Blower Motor Control circuit.
Is the resistance below 10K ohms?
Yes → Repair the Blower Motor Control circuit for a short to ground.
→ Go To 4
No
POSSIBLE CAUSES
ACTION
Perform BODY VERIFICATION TEST - VER 1.
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.
Perform BODY VERIFICATION TEST - VER 1.
345
HEATING & A/C
APPLICABILITY
All
All
All
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