GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

Important: In order to avoid misdiagnosis, set the J 39200 to zero before you take any measurements.

1

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the ambient air temperature sensor connector.
  3. Connect a fused (3 amp) jumper between terminal A and terminal B of the ambient air temperature sensor harness connector.

Does the display read SC?

--

Go to Step 2

Go to Step 3

2

Replace the ambient air temperature sensor. Refer to Ambient Air Temperature Gage Sensor Replacement in Instrument Panel, Gauges and Console.

Has the repair been made and the system rechecked?

--

System OK

--

3

  1. Disconnect the driver information display connector.
  2. Connect a fused (3 amp) jumper between the ambient air temperature sensor harness connector terminal A and ground.
  3. Using a J 39200 DMM, check for continuity between the driver information display harness connector terminal 10 and ground.

Does the circuit show continuity to ground?

--

Go to Step 5

Go to Step 4

4

Repair poor connection or open in circuit 735 between the driver information display harness connector terminal 10 and the ambient air temperature sensor harness connector terminal A.

Has the repair been made and the system rechecked?

--

System OK

--

5

  1. Using a J 39200 DMM, check continuity between the driver information display harness connector terminal 10 and terminal 8.
  2. Reconnect the fused (3 amp) jumper between the ambient air temperature sensor harness connector terminal A and terminal B.
  3. Measure for continuity between circuit 1550 and circuit 735.

Does the circuit  1550 show continuity to circuit 735?

--

Go to Step 7

Go to Step 6

6

Repair poor connection or open in circuit 1550 between the ambient air temperature sensor harness connector terminal B and the driver information display harness connector terminal 8.

Has the repair been made and the system rechecked?

--

System OK

--

7

Replace the driver information display. Refer to Driver Information Center Replacement in Instrument Panel, Gauges and Console.

Has the repair been completed and the system rechecked?

--

System OK

--