Dtc B1157 (No. 1157): Air Bag Deployment Signal Input; Dtc B1170 (No. 1170): Eeprom Access Error; Dtc U0073 (No. 0073): Control Module Communication Bus Off; Dtc U0100 (No. 0100): Lost Communication With Ecm - Suzuki SX4 Service Manual

10B-21 Body Electrical Control System:

DTC B1157 (No. 1157): Air Bag Deployment Signal Input

Wiring Diagram
Refer to "DTC B1150 (No. 1150): Air Bag Communication Circuit Malfunction".
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 DTC check of 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.

DTC U0073 (No. 0073): Control Module Communication Bus Off

Refer to "Troubleshooting for CAN-DTC in Section 1A".

DTC U0100 (No. 0100): Lost Communication with ECM

Refer to "Troubleshooting for CAN-DTC in Section 1A".

DTC U0101 (No. 0101): Lost Communication with TCM

Refer to "Troubleshooting for CAN-DTC in Section 1A".

DTC U0155 (No. 0155): Lost Communication with Instrument Panel Cluster (IPC) Control Module

Refer to "Troubleshooting for CAN-DTC in Section 1A".

DTC U1144 (No. 1144): Lost Communication with Keyless Start Control Module

Refer to "Troubleshooting for CAN-DTC in Section 1A".
Action
Possible cause
• Air bag component parts
• BCM malfunction
Yes
Go to "DTC B1021:
Front Air Bag
Deployment Record in
Section 8B".
Possible cause
BCM malfunction
S7RW0AA204011
No
Substitute a known-
good BCM (included in
junction block) and
recheck.
S7RW0AA204012
S7RW0AA204013
S7RW0AA204014
S7RW0AA204015
S7RW0AA204016
S7RW0AA204017