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10B-22 Body Electrical Control System:
DTC B1157 (No.1157) Air Bag Deployment Signal Input
Wiring Diagram
[A]: Junction block assembly connector viewed from harness side
1. SDM
DTC Detecting Condition and Possible cause
DTC detecting condition
Air bag deployment signal is fed from SDM to BCM.
Flow Test Description
Step 1: Check DTC for SDM.
DTC troubleshooting
Step
1
Check DTC for SDM
1) Check DTC stored in SDM referring to "DTC Check: in
Section 8B".
Is DTC B1021 detected?
DTC B1170 (No. 1170): EEPROM access error
DTC Detecting Condition and Possible Cause
DTC detecting condition
Data write error or check sum error.
DTC Troubleshooting
NOTE:
Before performing steps below, be sure to perform "Body Electrical Control System Check: ".
1) Ignition switch OFF.
2) Replace BCM.
3) Repeat BCM Check Flow Table.
Action
2. BCM
3. Junction block assembly
Possible cause
• Air bag component parts
• BCM malfunction
Yes
Go to "DTC B1021:
Front Air Bag Module
Deployed: in Section
8B".
Possible cause
BCM malfunction
S4RS0AA204023
I4RS0AA20012-
No
Substitute a known-
good BCM (included in
junction block
assembly) and recheck.
S4RS0AA204012
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