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scan tool to monitor LH MIX MTR POSITION FEEDBACK. A normal position feedback signal
should range between 0-255 counts as electric actuator is being moved.
Diagnostic Procedure
1. Perform diagnostic system check. See DIAGNOSTIC SYSTEM CHECK under
TROUBLE SHOOTING. Go to next step.
2. Connect scan tool. Turn ignition on. Observe LH MIX MTR POSITION FEEDBACK
parameter in HVAC data list. If scan tool indicates LH MIX MTR POSITION
FEEDBACK parameter is between 5-250 counts, see DIAGNOSTIC AIDS . If scan tool
indicates LH MIX MTR POSITION FEEDBACK parameter is not between 5-250 counts,
go to next step.
3. Turn ignition off. Disconnect left air temperature actuator. Turn ignition on. Observe LH
MIX MTR POSITION FEEDBACK parameter in HVAC data list. If scan tool indicates
LH MIX MTR POSITION FEEDBACK parameter is 250 counts or more, go to next step.
If scan tool indicates LH MIX MTR POSITION FEEDBACK parameter is less than 250
counts, go to step 8 .
4. Turn ignition off. Connect a fused jumper wire between terminals No. 9 (Light Blue wire)
and No. 7 (Gray/Black wire) of left air temperature actuator. Turn ignition on. Observe LH
MIX MTR POSITION FEEDBACK parameter in HVAC data list. If scan tool indicates
LH MIX MTR POSITION FEEDBACK parameter is 5 counts or less, go to next step. If
scan tool indicates LH MIX MTR POSITION FEEDBACK parameter is more than 5
counts, go to step 9 .
5. Turn ignition off. Connect a fused jumper wire between terminals No. 5 (Brown wire) and
No. 10 (Yellow wire) of left air temperature actuator. Turn ignition on. Observe LH MIX
MTR POSITION FEEDBACK parameter in HVAC data list. If scan tool indicates LH
MIX MTR POSITION FEEDBACK parameter is more than 250 counts, go to step 7 . If
scan tool indicates LH MIX MTR POSITION FEEDBACK parameter is 250 counts or less,
go to next step.
6. Disconnect left air temperature harness connector. Check continuity between ground and
terminal No. 10 (Yellow wire) of left air temperature actuator. If continuity exists, repair
short to ground in Yellow wire between left air temperature actuator and terminal C10 of
HVAC control head and go to step 15 . If continuity does not exist, go to step 12 .
7. Measure continuity in Yellow wire between terminal No. 10 of left air temperature actuator
and terminal C10 of HVAC control head. If continuity exists, go to step 11 . If continuity
does not exist, repair open or high resistance in Yellow wire and go to step 15 .
8. Turn ignition off. Check continuity between ground and terminal No. 9 (Light Blue wire) of
left air temperature actuator harness connector. If continuity exists, repair short to ground in
Light Blue wire between left air temperature actuator and terminal C8 of HVAC control
2001 Chevrolet Corvette
2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette
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