GM Service Manual Online
For 1990-2009 cars only

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

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the scan tool from the Data Link Connector (DLC).
  3. Disconnect the electronic climate control  (ECC) module.
  4. Connect a DMM between cavity 2 of the DLC and cavity C11 of the ECC module.

Is there continuity present?

--

Go to Step 3

Go to Step 4

3

Replace the ECC. Refer to Control Assembly Replacement in HVAC Systems with A/C - Automatic.

Is the repair complete?

--

Go to Data Link Communications System Check

--

4

Connect the DMM between cavity 2 of the DLC and cavity A of the Splice Pack  (SP201).

Is there continuity present?

--

Go to Step 5

Go to Step 7

5

Connect the DMM between cavity A of SP201 and cavity L of SP201. Is there continuity present?

--

Go to Step 6

Go to Step 9

6

Connect the DMM between cavity L of SP201 and cavity C11 of the ECC.

Is there continuity present?

--

Go to Data Link Communications System Check

Go to Step 8

7

Locate and repair the open or cause of resistance in CKT 1132 (PPL) between the DLC and the SP201.

Is the repair complete?

--

Go to Data Link Communications System Check

--

8

Locate and repair the open or cause of resistance in CKT 1038 (WHT) between SP201 and the ECC.

Is the repair complete?

--

Go to Data Link Communications System Check

--

9

Replace the splice pack terminal.

Is the repair complete?

--

Go to Data Link Communications System Check

--