For 1990-2009 cars

Step | Action | Value(s) | Yes | No
--- | --- | --- | --- | ---
Schematic Reference: HVAC Schematics Connector End View Reference: Component Connector End Views
1 | Inspect other instrumentation lights. Are other lights OFF? | -- | Go to Diagnostic System Check - Vehicle to diagnose lighting first. | Go to Step 2
2 |

1. Remove the controller.
2. Measure the voltage between terminals A3 and A4 of the controller connector.

Does the voltage measure within the specified range?

11-14 V

Go to Step 4

Go to Step 3

3 | Repair the wiring harness between splice S204 and controller connector terminal A4 or between splice S203 and controller connector terminal A3 Did you complete the repair? | -- | System OK | --
4 | Inspect the illumination lamps. Is 1 lamp burned out? | -- | Go to Step 5 | System OK
5 | Replace the burned out illumination lamp. Did you complete the replacement? | -- | System OK | --