B1212

DTC B1212: Power Supply Circuit Malfunction

Wiring Diagram:

Wiring Diagram

CAUTION:
- Be sure to perform Air Bag Diagnostic System Check:Advanced Air Bag before starting diagnosis according to flow. Air Bag Diagnostic System Check
- 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:Advanced Air Bag. 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
The voltage measured at weight sensor power supply circuit is out of specification for specified time.

Flow Test Description
STEP 1: Check for DTC.
STEP 2: Check for short circuit between weight sensor circuit and power supply circuit in sensor ground circuit.
STEP 3: Check for short circuit between weight sensor circuit and ground in sensor ground circuit.
STEP 4: Check for high resistance or open wire in sensor ground circuit
Step 5: Check for short circuit between weight sensor circuit and power supply circuit in sensor power supply circuit.
STEP 6: Check for short circuit between weight sensor circuit and ground in sensor power supply circuit.
STEP 7: Check for high resistance or open wire in sensor power supply circuit.

Step 1 - 2:

Step 3 - 4:

Step 5:

Step 6 - 7:

DTC Troubleshooting