GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Prizm 🢒 DTC 🢒 DTC 73 LH Pretens Deploy. Loop Resistance Low

Object Number: 238653 Size: SF
SIR Components
SIR Schematics
SIR Caution
SIR Caution
Handling ESD Sensitive Parts Notice

Circuit Description

When you first turn the ignition switch to the ON position, the inflatable restraint Sensing and Diagnostic Module (SDM) performs tests to diagnose critical malfunctions within itself. The SDM monitors the voltages at LH PRETENSIONER LOW terminal 1 to calculate the combined resistance of the LH seat belt pretensioner and its associated wiring.

Conditions for Setting the DTC

The SDM detects low resistance in the seat belt pretensioner deployment loop.

Action Taken When the DTC Sets
    • The SDM sets a Diagnostic Trouble Code.
    • The SDM flashes the AIR BAG warning lamp.

Conditions for Clearing the DTC

All DTCs are cleared with each ignition cycle.

Test Description

  1. This test checks for a short between the LH pretensioner high and low circuits.

    2.

  2. This test determines if the malfunction is caused by the SDM.

    3.

  3. This test determines if the malfunction is caused by the LH pretensioner.

Step

Action

Value(s)

Yes

No

1

Was the SIR Diagnostic System Check performed?

--

Go to Step 2

Go to SIR Diagnostic System Check

2

  1. Turn the ignition switch to the OFF position.
  2. Disconnect the inflatable restraint Sensing and Diagnostic Module (SDM).
  3. Disconnect the LH seat belt pretensioner.
  4. Release the shorting bar on the SDM connector C1.
  5. Measure the resistance at the pretensioner harness connector between terminal 1 and 2.

Is the resistance measured equal to the specified value?

OL

(Infinite)

Go to Step 3

Go to Step 7

3

  1. Connect the SDM.
  2. Turn the ignition switch to the ACC or ON position and wait 20 seconds.
  3. Read SIR DTCs

Is DTC 73 present?

--

Go to Step 5

Go to Step 4

4

  1. Turn the ignition switch to the OFF position.
  2. Connect the pretensioner connector.
  3. Turn the ignition switch to ACC or ON and wait 20 seconds.
  4. Read SIR DTCs.

Is DTC 73 present?

--

Go to Step 6

Go to Step 8

5

Replace the inflatable restraint Sensing and Diagnostic Module (SDM). Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .

Are all repairs complete?

--

Go to Step 9

--

6

Replace the driver seat belt. Refer to Seat Belt Retractor Replacement - Left Front in Seat Belts.

Are all repairs complete?

--

Go to Step 9

--

7

Repair the IP wiring harness between the pretensioner and the SDM. Refer to Wiring Repair .

Are all repairs complete?

--

Go to Step 9

--

8

An intermittent exists in the driver seat belt deployment loop. Refer to diagnostic aids.

Are all repairs complete?

--

Go to Step 9

--

9

Reconnect all SIR components. Make sure all components are properly mounted.

Have all the SIR components been reconnected and properly mounted?

--

Go to SIR Diagnostic System Check

--