GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Chevrolet 🢒 1998 🢒 Prizm 🢒 DTC 🢒 DTC 54 Pass. Air Bag Deploy. Loop Resistance High

Object Number: 238645 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 PASSENGER SIDE LOW terminal 8 to calculate the combined resistance of the IP module and its associated wiring.

Conditions for Setting the DTC

The SDM detects an open circuit or high resistance in the passenger deployment loop.

Action Taken When the DTC Sets
    • The SDM sets a Diagnostic Trouble Code.
    • The SDM turns ON 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 an open in the passenger side high or low circuits.

    2.

  2. This test checks for an open or high resistance in the YEL/RED wire.

    3.

  3. This test checks for an open or high resistance in the YEL/GRN wire.

    4.

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

    5.

  5. This test determines if the malfunction is caused by the inflatable restraint instrument panel module.

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 inflatable restraint IP module.
  4. Measure the resistance at the IP module harness connector between terminals 1 and 2.

Is the resistance measured less than the specified value?

OL

(Infinite)

Go to Step 9

Go to Step 3

3

Measure the resistance between the IP module harness connector terminal 1 and the SDM harness connector terminal 7.

Is the resistance measured equal to or less than the specified value?

1ohms

Go to Step 4

Go to Step 9

4

Measure the resistance between the IP module harness connector terminal 2 and the SDM harness connector terminal 8.

Is the resistance measured equal to or less than the specified value?

1ohms

Go to Step 5

Go to Step 9

5

  1. Connect the SDM.
  2. Connect a jumper wire between terminals 1 and 2 of the IP module harness connector.
  3. Turn the ignition switch to the ON position and wait 20 seconds.
  4. Read SIR DTCs

Is DTC 54 present?

--

Go to Step 7

Go to Step 6

6

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

Is DTC 54 present?

--

Go to Step 8

Go to Step 10

7

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

Are the repairs complete?

--

Go to Step 11

--

8

Replace the inflatable restraint IP module. Refer to Inflatable Restraint Instrument Panel Module Replacement .

Are the repairs complete?

--

Go to Step 11

--

9

Repair the open or high resistance condition in the IP wiring harness between the IP module and the SDM. Refer to Wiring Repair .

Are the repairs complete?

--

Go to Step 11

--

10

An intermittent exists in the passenger deployment loop. Refer to diagnostic aids.

Are the repairs complete?

--

Go to Step 11

--

11

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

--