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 Data Processor connector C2.
  2. Measure the voltage between cavity 19 of the Navigation Data Processor harness connector C2 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 6 of the Navigation Data Processor harness connector C2 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 2061 between cavity 19 of the Navigation Data Processor connector C2 and cavity 7 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 19 of the Navigation Data Processor harness connector C2 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 2062 between cavity 6 of the Navigation Data Processor connector C2 and cavity 8 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 6 of the Navigation Data Processor harness connector C2 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 2061 between cavity 19 of the Navigation Data Processor connector C2 and cavity 7 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 19 of the Navigation Data Processor harness connector C2 and cavity 7 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 2062 between cavity 6 of the Navigation Data Processor connector C2 and cavity 8 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 6 of the Navigation Data Processor harness connector C2 and cavity 8 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 2061 between cavity 19 of the Navigation Data Processor connector C2 and cavity 7 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 Data Processor. Refer to Navigation Data Processor Replacement in Body Rear End.

Is the replacement complete?

--

Go to Navigation System Check

--

14

Repair the open in circuit 2062 between cavity 6 of the Navigation Data Processor connector C2 and cavity 8 of the Radio connector C2. Refer to Wiring Repairs in Wiring Systems.

Is the repair complete?

--

Go to Navigation System Check

--