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resistance in Brown wire between fuse No. 27 (10-amp) in instrument panel electrical
center (fuse block) and vacuum/electric solenoid. After repair, go to step 7 .
6. Measure voltage between terminal No. 6 (Brown wire) of vacuum/electric solenoid and
terminals D8 (Dark Green wire), D9 (Light Green wire), D10 (Purple wire), D11 (Light
Green wire) and D13 (Pink wire) of HVAC control head. See Fig. 6 . Switch HVAC
control head through operating modes listed in SOLENOID SCAN TOOL DISPLAY
table. If each circuit shows voltage only when solenoid is on, replace HVAC control head
and go to step 7 . See HVAC CONTROL HEAD under REMOVAL &
INSTALLATION.
If all circuits do not show voltage when solenoid is on or show voltage when solenoid is not
on, repair open or high resistance between vacuum/electric solenoid and effected terminal(s)
of HVAC control head and go to step
solenoid. See VACUUM/ELECTRIC SOLENOID under REMOVAL &
INSTALLATION and go to step 7 .
7. 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.
LEFT TEMPERATURE CONTROL INOPERATIVE
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. Depress AUTO button to off.
Turn passenger's control knob to center position. Operate driver's control knob through full
range of movement. If scan tool displays LH MIX MTR and RH MIX MTR positions in
relation to control knob position, go to next step. If scan tool does not display correct left
and right actuator positions in relation to control knob position, go to step 9 .
3. Use scan tool to command LH MIX MTR in MISCELLANEOUS TESTS through full
range of movement. If scan tool indicates LH MIX MTR is operating properly, go to next
step. If scan tool indicates LH MIX MTR is not operating properly, go to step 5 .
4. Use scan tool to command RH MIX MTR in MISCELLANEOUS TESTS through full
range of movement. If scan tool indicates RH MIX MTR is operating properly, system is
operating properly at this time. If scan tool indicates RH MIX MTR is not operating
properly, go to step 6 .
5. Turn ignition off. Check continuity in Brown wire between terminal No. 5 (Brown wire) of
left air temperature actuator and HVAC fuse (10-amp) in instrument panel fuse block. If
continuity does not exist, repair open in Brown wire. If continuity exists, check continuity in
2001 Chevrolet Corvette
2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette
7
. If all circuits are okay, replace vacuum/electric
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