GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Pontiac 🢒 2005 🢒 Matiz 🢒 Preface 🢒 Cautions and Notices 🢒 Diagnostic System Check - SIR

Circuit Description

When the ignition switch is turned ON, the sensing and diagnostic module (SDM) is able to send serial data from the terminal 9 of the SDM to the terminal J (13) of the assembly line diagnostic link.

Step

Action

Values

Yes

No

Caution: Refer to Battery Disconnect Caution in the Preface section.

CAUTION: Be careful when you handle a sensing and diagnostic module (SDM). Do not strike or jolt the SDM. Before applying power to the SDM:

   • Remove any dirt, grease, etc. from the mounting surface
   • Position the SDM horizontally on the mounting surface
   • Point the arrow on the SDM toward the front of the vehicle
   • Tighten all of the SDM fasteners and SDM bracket fasteners to the specified torque value
Failure to follow the correct procedure could cause air bag deployment, personal injury, or unnecessary SIR system repairs.

Caution: This vehicle is equipped with Supplemental Inflatable Restraint (SIR). Refer to the Cautions in the On-Vehicle Service and the SIR Component and Wiring Location view in the Supplemental Inflatable (SIR) System before any performing service on or around SIR components or wiring. Failure to follow the Cautions could result in possible air bag deployment, personal injury, or otherwise unneeded SIR system repairs.

1
  1. Turn the ignition ON.
  2. Check the warning lamp.

Does the warning lamp turn OFF after 4 seconds?

--

System OK

Go to Step 2

2
  1. Connect the scan tool cable to the data link connector (DLC).
  2. Connect the scan tool power cable to the cigar lighter socket.
  3. Select the air bag main menu on the scan tool.
  4. Select Fail Code View & Clear from the displayed menu of the diagnostic test codes (DTCs).

Are there any active fault codes?

--

Go to the DTC table for the fault indicated

Go to Step 3

3

Check fuse F2.

Is the fuse F2 blown?

--

Go to Step 4

Go to Step 5

4

Replace fuse F2.

Is the repair complete?

--

System OK

--

5
  1. Disconnect the electrical connector C208.
  2. Check for a short to ground between fuse F2 and terminal 2 of connector C208.

Is wiring harness shorted to ground?

--

Go to Step 6

Go to Step 7

6

Repair a short to ground between fuse F2 and terminal 2 of connector C208.

Is the repair complete?

--

System OK

--

7
  1. Disconnect the SDM electrical connector.
  2. Check for a short to ground between terminal 2 and terminal 5 of the SDM connector.

Is wiring harness shorted to ground?

--

Go to Step 15

Go to Step 8

8

Use an ohmmeter to check for continuity between terminal A (4) of the DLC and ground G201.

Does the ohmmeter show the specified value?

0 ohms

Go to Step 9

Go to Step 10

9

Repair the open DLC ground circuit.

Is the repair complete?

--

System OK

--

10
  1. Turn the ignition ON.
  2. Check the voltage at the cigar lighter positive terminal.

Does the voltmeter show the specified value?

11-14 V

Go to Step 12

Go to Step 11

11

Repair the power supply for the cigar lighter socket.

Is the repair complete?

--

System OK

--

12

Check for a short to ground or open circuit between terminal J (13) of the DLC and terminal 4 of connector 208.

Is the wiring harness shorted to ground or open?

--

Go to Step 13

Go to Step 14

13

Repair a short to ground or open circuit between terminal J (13) of the DLC and terminal 4 of connector C208.

Is the repair complete?

--

System OK

--

14

Check for a short to ground or open between terminal 4 of connector C208 and terminal 9 of the SDM connector.

Is wiring harness shorted to ground or open?

--

Go to Step 15

Go to Step 16

15

Replace the SDM wiring harness.

Is the repair complete?

--

System OK

--

16

Replace the SDM.

Is the repair complete?

--

System OK

--