GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Cadillac 🢒 1998 🢒 Catera 🢒 Body and Accessories 🢒 Wiring Systems 🢒 Scan Tool Does Not Communicate with Sun Roof Actuator

Step

Action

Value(s)

Yes

No

1

Was the Data Link Communications System Check performed?

--

Go to Step 2

Go to Data Link Communications System Check

2

Attempt to establish communication with the theft deterrent module (immobilizer).

Does the scan tool communicate with the immobilizer?

--

Go to Step 3

Go to Step 4

3

Is the sun roof operating properly?

--

Go to Step 5

Go to Step 6

4
  1. Disconnect the immobilizer connector.
  2. Attempt to communicate with the sun roof actuator.

Does the scan tool communicate with the sun roof actuator?

--

Go to Step 12

Go to Step 13

5

Inspect for poor connections at the sun roof connector terminal 4. Refer to Intermittents and Poor Connections Diagnosis in Wiring Systems.

Did you find and correct the poor connection condition?

--

Go to Step 7

Go to Step 8

6
  1. Inspect the SUNROOF fuse for an open.
  2. Inspect and test the sun roof actuator battery feed circuit at terminal 1 for proper voltage (11-13 V).
  3. Inspect and test the ground circuit at terminal 2.
  4. Make necessary repairs.

Did you find and correct any conditions?

--

Go to Step 9

Go to Step 8

7

Attempt to establish communications with the sun roof actuator.

Does the scan tool communicate with the sun roof actuator?

--

System OK

Go to Step 8

8
  1. Disconnect the sun roof actuator connector.
  2. Measure the resistance between the connector terminal 4 and the data link connector (DLC) terminal 3.

Does the resistance measure less than the specified value?

5 ohms

Go to Step 11

Go to Step 10

9

Is the sun roof operating properly?

--

Go to Step 7

Go to Step 8

10

Locate and repair an open in CKT XM700 (BRN/WHT).

Is the repair complete?

--

Go to Step 7

--

11
  1. Replace the sun roof actuator.
  2. Important: Perform the set up procedure for the sun roof actuator.

Is the replacement complete?

--

Go to Step 7

--

12

Replace the immobilizer.

Is the replacement complete?

--

Go to Step 7

--

13

Test the serial data circuit, of the DLC, for a short to ground between terminal 3 and each module.

    • Immobilizer connector terminal 8
    • Sun Roof Actuator terminal 4

Did you find a short to ground in the serial data circuit?

--

Go to Step 14

Go to Step 15

14

Locate and repair the short to ground in the serial data circuit.

Is the repair complete?

--

Go to Step 7

--

15

Test the serial data circuit, of the DLC, for a short to voltage between terminal 3 and each module.

    • Immobilizer connector terminal 8
    • Sun Roof Actuator connector terminal 4

Did you find a short to voltage in the serial data circuit?

--

Go to Step 16

Go to Step 11

16

Locate and repair the short to voltage in the serial data circuit.

Is the repair complete?

--

Go to Step 7

--