Air Conditioning Control Assembly: Inspection

WARNING: This page is about a different car, the 2004 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 Fig 1 .

Fig 1: Inspecting Indictor Operation (Table) (1 Of 2)
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If operation is not as specified, replace the P/C board.

Fig 2: Inspecting Indictor Operation (2 Of 2)
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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 Fig 3 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
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INSPECT SWITCH OPERATION
Check the continuity exists between terminals while the switch is pressed.

Fig 4: Inspecting Switch Operation (Table) (1 Of 2)
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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.

Fig 5: Inspecting Switch Operation (2 Of 2)
Courtesy of © TOYOTA, LICENSE AGREEMENT TMS1002