Air Conditioning Control Assembly: Inspection

WARNING: This page is about a different car, the 2003 Lexus IS 300. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT INDICTOR OPERATION
Connect the positive (+) lead from the battery to terminal 4 and negative (-) lead to each terminal, then check that the indicator lights up as shown in the switch tester connection chart.

Fig 1: Inspecting Indictor Operation
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 2: Switch Tester Connection Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If operation is not as specified, replace the P/C board.
INSPECT INDICATOR DIMMING OPERATION
1. Perform each indicator light up. See step 1.
2. Connect the positive (+) lead from the battery to terminal 1 and check that the each indicator dims.
If the operation is not as specified, replace the P/C board.

If the operation is as specified, replace the A/C amplifier.
INSPECT BULB OPERATION
Apply the tester as shown in the illustration to the test for continuity.

If continuity exists, replace the P/C board.

If on continuity exists, replace the bulb.

Fig 3: Inspecting Bulb Operation
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002
INSPECT SWITCH OPERATION
Check the continuity exists between terminals while the switch is pressed.

Fig 4: Switch Continuity Condition Chart
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

Fig 5: Inspecting Switch Operation
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002

If operations is not as specified, replace the P/C board.

If operations is as specified, check the wire harness or replace the A/C amplifier.