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3. Turn ignition off. Disconnect inside air temperature sensor. Turn ignition on. Use scan tool
to observe INSIDE AIR TEMPERATURE SENSOR parameter. If scan tool indicates more
than 4.9 volts, go to next step. If scan tool indicates 4.9 volts or less, go to step 5 .
4. Turn off ignition. Connect a fused jumper wire between terminal "A" (Dark Green wire)
and terminal "B" (Gray/Black wire) of inside temperature sensor harness connector. Turn
ignition on (engine off). With scan tool, observe INSIDE AIR TEMP SENSOR parameter.
If scan tool indicates 0.1 volt or more exists, go to step 8 . If scan tool indicates less than 0.1
volt exists, go to step 6 .
5. Check continuity between ground and terminal "A" (Dark Green wire) of inside air
temperature sensor. If continuity exists, repair short to ground in Dark Green wire between
inside air temperature sensor and terminal D2 of HVAC control head and go to step 12 . If
continuity does not exist, go to step 9 .
6. Measure voltage between ground and terminal "A" (Dark Green wire) of inside air
temperature sensor. If voltage exists, repair short to voltage in Dark Green wire between
inside air temperature sensor and terminal D2 of HVAC control head. After repair, go to
step 12 . If voltage does not exist, check continuity in Dark Green wire between terminal
"A" of inside air temperature sensor and terminal D2 of HVAC control head. If continuity
exists, go to next step. If continuity does not exist, repair open or high resistance in Dark
Green wire and go to step 12 .
7. Check continuity of Gray/Black wire between terminal "B" of inside air temperature sensor
and terminal D1 of HVAC control head. If continuity exists, go to step 9 . If continuity does
not exist, repair open in Gray/Black wire and go to step 12 .
8. Check for loose wires and or poor connections at inside air temperature sensor. Repair any
problems found and go to step 12 . If wiring and connectors are okay, go to step 10 .
9. Check for loose wires and or poor connections to HVAC control head. Repair any problems
found and go to step 12 . If wiring and connectors are okay, go to step 11 .
10. Replace inside air temperature sensor. See INSIDE AIR TEMPERATURE SENSOR
under REMOVAL & INSTALLATION. After repair, go to step 12 .
11. Replace HVAC control head. See HVAC CONTROL HEAD under REMOVAL &
INSTALLATION and go to next step.
12. 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 B0338: INSIDE AIR TEMPERATURE SENSOR OPEN
Diagnostic Aids
2001 Chevrolet Corvette
2000-01 AUTOMATIC A/C-HEATER SYSTEMS Corvette
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