GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 GMC_Truck 🢒 2000 🢒 Yukon - 2WD 🢒 Body and Accessories 🢒 Stationary Windows 🢒 Mirrors - Automatic Day-Night Mirror Displays OC

Step

Action

Yes

No

SCHEMATIC REFERENCE: Automatic Day-Night Mirrors Schematics

1

Did you review the Automatic Day-Night Mirror operation and perform the necessary inspections?

Go to Step 2

Go to Symptoms

2
  1. Turn ON the ignition, with the engine OFF.
  2. Depress the temperature display button on the automatic day-night mirror.

Does the mirror temperature display show a temperature reading?

Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems

Go to Step 3

3
  1. Turn OFF the ignition.
  2. Disconnect the outside temperature sensor.
  3. Connect a 3 amp fused jumper wire between the signal circuit of the outside temperature sensor and the low reference circuit of the outside temperature sensor.
  4. Turn ON the ignition, with the engine OFF.

Does the mirror temperature display show SC?

Go to Step 7

Go to Step 4

4
  1. Turn OFF the ignition.
  2. Connect a 3 amp fused jumper wire between the outside temperature sensor signal circuit and a good ground.
  3. Turn ON the ignition, with the engine OFF.

Does the mirror temperature display show SC?

Go to Step 6

Go to Step 5

5

Test the signal circuit of the outside temperature sensor for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 8

6

Test the low reference circuit of the outside temperature sensor for an open or high resistance. Refer to Circuit Testing and Wiring Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 8

7

Inspect for a poor connection at the harness connector of the outside temperature sensor. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 9

8

Inspect for a poor connection at the harness connector of the automatic day-night mirror. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs in Wiring Systems.

Did you find and correct the condition?

Go to Step 11

Go to Step 10

9

Replace the outside temperature sensor.

Did you complete the replacement?

Go to Step 11

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10

Replace the automatic day-night mirror. Refer to Inside Rearview Mirror Replacement .

Did you complete the replacement?

Go to Step 11

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11

Operate the system in order to verify the repair.

Did you correct the condition?

System OK

Go to Step 3