GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Did you perform the Heater Blower Controls System Check?

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Go to Step 2

Go to Heater Blower Controls System Check

2

  1. Place the ignition switch in the RUN position.
  2. Disconnect the rear heater switch connector.

Did the rear heater blower motor stop running?

--

Go to Step 3

Go to Step 4

3

Replace the rear heater switch.

Refer to Control Switch Replacement - Auxiliary .

Is the repair complete?

--

Go to Heater Blower Controls System Check

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4

Disconnect the rear heater resister pack.

Did the rear heater blower motor stop running?

--

Go to Step 5

Go to Step 6

5

Connect a test lampJ 35616-200 from the rear heater switch CKT 1925 (RED) cavity B to ground.

Did the test lamp light?

--

Go to Step 7

Go to Step 8

6

Repair the short to voltage in CKT 1924 (WHT) or CKT 1172 (YEL) between the rear heater blower motor and the rear heater switch.

Is the repair complete?

--

Go to Heater Blower Controls System Check

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7

Repair the short to voltage in CKT 1925 (RED) between the rear heater resistor pack and the rear heater switch.

Is the repair complete?

--

Go to Heater Blower Controls System Check

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8

Repair the short to voltage in CKT 1926 (DK BLU) between the rear heater resistor pack and the rear heater switch.

Is the repair complete?

--

Go to Heater Blower Controls System Check

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