B1211

DTC B1211: Serial Communication Problem Between OCM and SDM

Wiring Diagram:

Wiring Diagram

CAUTION:
- Be sure to perform Air Bag Diagnostic System Check before starting diagnosis according to flow.
- When measurement of resistance or voltage is required in this flow, use a tester along with a correct terminal adapter from special tool (Connector test adapter kit).
- When a check for proper connection is required, refer to Inspection of Intermittent and Poor Connections.
- If there is open circuit in air bag wire harness, connector or terminal is found damaged, replace the wire harness, connector and terminal as an assembly.

DTC Will Set when
Between OCM and SDM communication signal voltage is out of specification for specified time.

Flow Test Description

Step 1 - 2:

Step 3 - 4:

Step 1: Check for DTC.
Step 2: Check for short circuit between OCM-SDM serial communication circuit and ground.
Step 3: Check for short circuit between OCM-SDM serial communication circuit and power supply circuit.
Step 4: Check for open circuit in OCM-SDM serial communication circuit.

NOTE: Upon completion of inspection and repair work, perform the following items.
- Reconnect all air bag system components and ensure all components are properly mounted.
- Clear DTCs.
- Repeat Air Bag Diagnostic System Check to confirm that the trouble has been corrected.
- Perform occupant classification system rezeroing.
- Perform occupant classification system sensitivity check.