B1112

DTC B1112 - Battery Voltage Too Low

CIRCUIT DESCRIPTION
The SRS is equipped with a voltage-increase or decrease circuit (DC-DC converter) in the SRSCM in case the source voltage down or up.
When the battery voltage down or up the voltage-increase or decrease circuit (DC-DC converter) function to increase or decrease the voltage of the SRS to normal voltage.
The diagnosis system malfunction display for this circuit is different to other circuits-when the SRS warning lamp remains lit up and the DTC is a B1112 code, battery voltage too high or low is indicated.
Malfunction in this circuit is not recorded in the B1112 code, battery voltage too high or low, and the voltage returns to normal, the SRS warning light automatically goes off.

INSPECTION PROCEDURE




1. Preparation.
1. Disconnect negative (-) terminal cable from the battery, and wait at least 30 seconds.
2. Remove the DAB module.
3. Disconnect connectors of PAB left and right side airbag, belt pretensioner and satellite sensor.
4. Disconnect connector of SRSCM.

CAUTION: Store the DAB with the front surface facing upward.




2. Check source voltage.
1. Connect negative (-) terminal cable to battery.
2. Turn ignition switch ON.

CHECK: Measure voltage between the battery supply 5 of SRS connector and body ground.

LIMIT: 10 - 16.5 V

NG: Check the harness between battery and SRSCM, and check the battery and charging system.

OK: Continue to next step.

3. Does SRS warning light turn off ?




PREPARATION
1. Turn ignition switch to LOCK.
2. Connect the DAB module.
3. Connect PAB connector, and belt pretensioner.
4. Connect SRSCM connector.
5. Turn ignition switch ON.

CHECK: Check that SRS warning light goes off.

NG: Check for DTCs. If a DTC is output, perform troubleshooting for the DTC. If B1112 is output, replace SRSCM.

OK: From the results of the above inspection, the malfunctioning part can now be considered normal.