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begins with a "U" indicates that some other module is not communicating. If scan tool does
not display any DTCs that begin with "U", go to next step.
5. If scan tool displays any DTCs which begin with B10xx (xx represents any 2 other
characters), see DTC list in appropriate BODY CONTROL MODULES article in
ACCESSORIES & EQUIPMENT. If any DTCs exist which do not start with B10xx, go to
next step.
6. If scan tool displays any DTCs that begin with a "B" which are associated with charging
system, see appropriate GENERATORS & REGULATORS article in STARTING &
CHARGING SYSTEMS. If scan tool does not display any DTCs which are associated with
charging system, go to next step.
7. If scan tool displays any HVAC related DTCs, see DIAGNOSTIC TROUBLE CODE
DEFINITION table under SELF-DIAGNOSTICS. If scan tool does not display any DTCs
which are associated with HVAC system, go to appropriate SELF-DIAGNOSTICS article
in ENGINE PERFORMANCE.
SYMPTOM TESTS
BLOWER MOTOR INOPERATIVE AT ANY SPEED
1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under
TROUBLE SHOOTING. After diagnostic system check, go to next step.
2. Connect scan tool. Turn ignition on. Display HVAC data list. Operate blower speed control
switch from highest to lowest speed settings. If scan tool displays speeds decreasing and
increasing in relation to blower speed switch position, go to next step. If scan tool does not
display decreasing and increasing speeds in relation to setting of blower speed switch
position, replace HVAC control head (panel) and go to step 9 . See HVAC CONTROL
HEAD under REMOVAL & INSTALLATION.
3. Disconnect blower motor control module harness connector. Turn ignition on. Switch on
blower motor. Measure voltage between ground and terminal "B" (Red wire) of blower
control module harness connector. If battery voltage exists, go to next step. If battery
voltage does not exist, repair open or high resistance in Red wire between terminal "B" of
blower motor control module and BLO MOT fuse No. 51 (30-amp) of instrument panel
electrical center (fuse block) and go to step
4. Measure voltage between terminal "B" (Red wire) and terminal "A" (Black wire) of blower
motor control module. If battery voltage exists, go to step 6 . If battery voltage does not
exist, repair open or high resistance in Black wire between blower motor control module
and ground (located at base of right "A" pillar) and go to step 9 .
5. Inspect BLO MOT fuse (30-amp) in instrument panel electrical center (fuse block) for an
2001 Chevrolet Corvette
2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette
9
.
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