GM Service Manual Online
For 1990-2009 cars only

Step

Action

Value(s)

Yes

No

1

Was the entire Navigation System Check performed?

--

Go to step 2

Go to Navigation System Check

2

  1. Disconnect the Navigation Display Module connector C3.
  2. Measure the voltage between cavity 21 of the Navigation Display Module harness connector C3 and ground with a DMM.

Is the voltage measured within the specified range?

0 V

Go to step 3

Go to step 4

3

Measure the voltage between cavity 8 of the Navigation Display Module harness connector C3 and ground with a DMM.

Is the voltage measured within the specified range?

0 V

Go to step 5

Go to step 6

4

Repair the short to B+ in circuit 2054 between cavity 21 of the Navigation Display Module connector C3 and cavity 14 of the Radio connector C2. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Navigation System Check

--

5

Measure the resistance between cavity 21 of the Navigation Display Module harness connector C3 and ground with a DMM.

Is the resistance measured within the specified range?

Infinite

Go to step 7

Go to step 8

6

Repair the short to B+ in circuit 2055 between cavity 8 of the Navigation Display Module connector C3 and cavity 15 of the Radio connector C2. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Navigation System Check

--

7

Measure the resistance between cavity 8 of the Navigation Display Module harness connector C3 and ground with a DMM.

Is the resistance measured within the specified range?

Infinite

Go to step 9

Go to step 10

8

Repair the short to ground in circuit 2054 between cavity 21 of the Navigation Display Module connector C3 and cavity 14 of the Radio connector C2. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Navigation System Check

--

9

  1. Disconnect the Radio connector C2.
  2. Measure the resistance between cavity 21 of the Navigation Display Module harness connector C3 and cavity 14 of the Radio harness connector C2 with a DMM.

Is the resistance measured within the specified range?

0-2 ohms

Go to step 11

Go to step 12

10

Repair the short to ground in circuit 2055 between cavity 8 of the Navigation Display Module connector C3 and cavity 15 of the Radio connector C3. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Navigation System Check

--

11

Measure the resistance between cavity 8 of the Navigation Display Module harness connector C3 and cavity 15 of the Radio harness connector C2 with a DMM.

Is the resistance measured within the specified range?

0-2 ohms

Go to step 13

Go to step 14

12

Repair the open in circuit 2054 between cavity 21 of the Navigation Display Module connector C3 and cavity 14 of the Radio connector C2. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Navigation System Check

--

13

Replace the Navigation Display Module. Refer to Navigation Display Module Replacement in Body Rear End.

Is the replacement complete?

--

Go to Navigation System Check

--

14

Repair the open in circuit 2055 between cavity 8 of the Navigation Display Module connector C3 and cavity 15 of the Radio connector C2. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Navigation System Check

--