LEMON Manuals: Even more car manuals for everyone
Home >> Chevrolet >> 2001 >> Venture Base, Van Passenger >> Repair and Diagnosis >> External Pages >> Different car >> Section 17 (HVAC Systems - Automatic) >> Diagnostic Information and Procedures >> DTC B0446: HVAC Control Module Receives A Right Air Temperature Actuator Position Signal From The Right Air Temperature Actuator >> Test Description

Test Description

WARNING: This page is about a different car, the 2002 Buick Regal and 2002 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

The number(s) below refer to the step number(s) on the diagnostic table.

  1. 3. This step checks for a default action by the actuator. The actuator will default to 128 counts if the air temperature door position circuit is open, shorted to ground, or shorted to voltage. It will also default to this value if the low reference circuit or the 5 volt reference circuit is open.
  2. 4. Tests for the proper operation of the circuit in the high voltage range.
  3. 5. Tests for the proper operation of the circuit in the low voltage range. If the fuse in the jumper opens when you perform this test, the signal circuit is shorted to voltage.
  4. 6. Tests for a short to ground in the 5 volt reference circuit.
Fig 1: DTC B0446, Testing Procedures (1 of 2)
G01719984Courtesy of GENERAL MOTORS CORP.
Fig 2: DTC B0446, Testing Procedures (2 of 2)
G01719985Courtesy of GENERAL MOTORS CORP.
scientia non olet · About LEMON Manuals