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instrument panel electrical center and terminal "B" of blower motor control module and go
to step 9 . If BLO MOT fuse is not blown, repair open or high resistance in Red wire
between instrument panel electrical center and terminal "B" of blower motor control
module.
6. Turn ignition off. Connect blower motor control module harness connector. Disconnect
blower motor harness connector. Turn ignition on. Measure voltage between Red and Black
wire terminals of blower motor harness connector. If battery voltage exists, inspect and
repair blower motor harness and connector for damage or loose connections. Repair any
problem found and go to step 9 . If blower motor harness does not have any loose
connections or damage, replace blower motor. See MANUAL A/C-HEATER SYSTEMS -
CORVETTE article. If battery voltage does not exist, go to next step.
7. Measure voltage between ground and terminal "C" (Tan wire) of blower motor control
module (backprobe). Turn ignition on. Press A/C control head OFF button. If voltage is 4.5-
5.5 volts, go to next step. If voltage is not 4.5-5.5 volts, repair open or high resistance in
Tan wire between blower motor control module and terminal C11 of HVAC control head
and go to step 9 .
8. Measure voltage between ground and terminal "C" (Tan wire) of blower motor control
module harness connector. Turn ignition on. Set blower speed to maximum setting. If
voltage is 0.25-1.25 volts, inspect and repair any damage or loose connections on blower
motor control module and go to step 9 . If connections are okay, replace blower motor
control module and go to next step. See BLOWER MOTOR CONTROL MODULE
under REMOVAL & INSTALLATION. If voltage is not 0.25-1.25 volts, repair open or
high resistance in Tan wire between blower motor control module and terminal C11 of
HVAC control head and go to next step.
9. Use scan tool to clear DTCs. Operate vehicle and verify that DTCs do not reset. If DTCs
reset, go to DIAGNOSTIC SYSTEM CHECK under TROUBLE SHOOTING. If DTCs
do not reset, system is okay.
COMPRESSOR CLUTCH DOES NOT ENGAGE
NOTE:
A/C compressor clutch will not engage when A/C request is made
and no DTCs are present.
1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under
TROUBLE SHOOTING. After diagnostic system check, go to next step.
2. Use scan tool to display HVAC inputs screen. Depress A/C button. If scan tool indicates
A/C button is on while button is depressed, replace PCM and go to step 6 . If scan tool does
not indicate A/C button is on, replace HVAC control head (panel) and go to step 6 . See
HVAC CONTROL HEAD under REMOVAL & INSTALLATION.
2001 Chevrolet Corvette
2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette
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