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10. Check continuity of Gray/Black wire between terminal No. 7 of left air temperature
actuator and terminal D1 of HVAC control head. If continuity exists, go to step 15 . If
continuity does not exist, go to step 12 .
11. Check for loose wires and or poor connections at left air temperature actuator harness
connector. Repair any problems found and go to step 15 . If wiring and connectors are okay,
go to step 12 .
12. Check for loose wires and or loose connectors at HVAC control head. Repair any problems
found and go to step 15 . If wires and connectors are okay, go to step 14 .
13. Replace right air temperature actuator. See AIR TEMPERATURE ACTUATORS under
REMOVAL & INSTALLATION and go to step 15 .
14. Replace HVAC control head. See HVAC CONTROL HEAD under REMOVAL &
INSTALLATION and go to next step.
15. Use scan tool to clear DTCs. See CLEARING TROUBLE CODES under SELF-
DIAGNOSTICS. Operate vehicle and verify that DTCs do not reset. If DTCs reset, go to
step 2 . If DTCs do not reset, system is okay.
DTC B0446: RIGHT ACTUATOR OUT OF RANGE
Diagnostic Aids
If DTC is intermittent or has a history, perform tests while wiggling wiring and connectors. This
can often cause the malfunction to appear. Inspect sensor connector and harness for damage,
corrosion or water intrusion. Check for adequate terminal tension, harness routing, damaged wire
insulation, and broken wires.
Connect a scan tool to Diagnostic Link Connector (DLC) and turn ignition on. Select the
OUTPUT CONTROL screen in HVAC SPECIAL FUNCTIONS. Use MISCELLANEOUS
TEST screen to manually drive RH ELECTRIC ACTUATOR with scan tool from fully open to
fully closed. Use scan tool to monitor RH 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 RH MIX MTR POSITION FEEDBACK
parameter in HVAC data list. If scan tool indicates RH MIX MTR POSITION
FEEDBACK parameter is between 5-250 counts, see DIAGNOSTIC AIDS . If scan tool
indicates RH MIX MTR POSITION FEEDBACK parameter is not between 5-250 counts,
2001 Chevrolet Corvette
2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette
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