GM Service Manual Online
For 1990-2009 cars only
Makes 🢒 Buick 🢒 1999 🢒 Park Avenue 🢒 DTC 🢒 DTC B1155 SDM Calibration Mismatch

Object Number: 397192 Size: MF
SIR Components
SIR System Operation
SIR Handling Caution
Handling ESD Sensitive Parts Notice

Circuit Description

When the ignition switch is first turned to RUN, the body control module (SBM) sends a message over the serial data line Class 2 containing serial data keying information. When the ignition switch is first turned to RUN, the powertrain control module (PCM) sends a message over the serial data line Class 2 containing a partial vehicle identification number (VIN). The inflatable restraint sensing and diagnostic module (SDM) receives these messages and compares the messages to the information stored in memory. For more detailed information about the data lines, refer to Data Link Communications Description.

Conditions for Setting the DTC

If either or both of the messages do not match information stored in the SDM, DTC B1155 will set, along with DTC B1159 and/or DTC B1160 depending on the message that does not match. If the SDM does not receive the serial data keying message from the SBM, DTC B1159 will set without DTC B1155. If the SDM does not receive a partial VIN message from the PCM, DTC B1160 will set without DTC B1155. The POWER-ON test inspects for these DTCs. The SBM and PCM send these messages only at POWER-ON.

Action Taken When the DTC Sets

The SDM commands the instrument cluster to turn ON the AIR BAG warning lamp and sets 1 or more diagnostic trouble codes.

Conditions for Clearing DTC B1155

The DTC will clear when 1 of the following conditions is met:

    • Current DTC
        The ignition switch is turned OFF.
    • History DTC
       - You issue a scan tool CLEAR CODES command.
       - 250 malfunction free ignition cycles have occurred.

Conditions for Clearing DTC B1159 and B1160

The DTC will clear when 1 of the following conditions is met:

    • Current DTC
        The SDM receives the correct message over the serial data line class 2. The SBM/PCM send this message only at POWER-ON.
    • History DTC
       - You issue a scan tool CLEAR CODES command.
       - 250 malfunction free ignition cycles have occurred.

Diagnostic Aids

DTC B1155 sets only when the wrong message is sent by the SBM or PCM. The State Of Health (SOH) DTCs may set in addition to DTC B1155, DTC B1159 and DTC B1160. SOH DTCs will likely clear when the malfunction causing DTC B1155, DTC B1159 and DTC B1160 in order to set is repaired. Refer to Diagnostic Aids for the specific SOH DTC.

Test Description

The numbers below refer to the step numbers on the diagnostic table:

  1. If DTC B1155, DTC B1159, and DTC B1160 are all set, the SDM is receiving the massages from the SBM and the PCM, however both messages are incorrect according to the SDM in the vehicle.

    2.

  2. If DTC B1155 and DTC B1159 are set, then the SDM is receiving the wrong message from the SBM.

    3.

  3. If DTC B1155 and DTC B1160 are set, then the SDM is receiving the wrong message from the PCM.

    4.

  4. If DTC B1159 is set alone, then the SDM did not receive the message from the SBM.

    5.

  5. If DTC B1160 is set alone, then the SDM did not receive the message from the PCM.

    6.

  6. If DTC B1160 and DTC B1159 are set without DTC B1155, then the SDM did not receive either message from the SBM or the PCM.

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

Are DTC B1155, DTC B1159 and DTC B1160 all set?

--

Go to Step 3

Go to Step 4

3
  1. Turn the ignition switch to the OFF position.
  2. The incorrect SDM may have been installed in the vehicle.

Install the correct SDM in the vehicle. Refer to Inflatable Restraint Sensing and Diagnostic Module Replacement .

--

Go to SIR Diagnostic System Check

--

4

Inspect DTC B1155.

Are DTC B1155 and B1159 set?

--

Go to Step 5

Go to Step 6

5
  1. The incorrect SBM may have been installed in the vehicle or the SBM is programmed incorrectly.
  2. Install the correct SBM in the vehicle or re-program the SBM. Refer to Body Control Module (BCM) Programming/RPO Configuration in Body Control System.

Has the malfunction been repaired?

--

Go to SIR Diagnostic System Check

--

6

Are DTC B1155 and DTC B1160 set?

--

Go to Step 7

Go to Step 8

7
  1. The incorrect PCM is installed in the vehicle or the PCM is programmed incorrectly.
  2. Install the correct PCM or re-program the PCM. Refer to Powertrain Control Module Replacement/Programming in Engine Controls - 3.8L.

Has the malfunction been repaired?

--

Go to SIR Diagnostic System Check

--

8

Inspect DTC B1159.

Is DTC B1159 set alone?

--

Go to Step 9

Go to Step 10

9
  1. The SDM is not receiving the serial data key message from the SBM.
  2. Ensure that the SBM is connected and functioning properly. Refer to Diagnostic System Check - Body Control System in Body Control System.

Has the malfunction been repaired?

--

Go to SIR Diagnostic System Check

--

10

Inspect DTC B1160.

Is DTC B1160 set alone?

--

Go to Step 11

Go to Step 12

11
  1. The SDM is not receiving the partial VIN message from the PCM.
  2. Ensure that the PCM is connected and functioning correctly. Refer to Powertrain Control Module Replacement/Programming in Engine Controls - 3.8L.

Has the malfunction been repaired?

--

Go to SIR Diagnostic System Check

--

12

Inspect DTC B1160 and DTC B1159.

Are DTC B1160 and DTC B1159 set?

--

Go to Step 13

Go to Sensing and Diagnostic Module Integrity Check

13
  1. The SDM is not receiving both the partial VIN message from the PCM and the serial data key message from the SBM.
  2. Ensure that the Serial Data Class 2 line is functioning correctly. Refer to Data Link Communications System Check in Data Link Communications.

Has the malfunction been repaired?

--

Go to SIR Diagnostic System Check

--