Standard Testing
DTC B1111 Battery Voltage Too HighCircuit Description
The SRS is equipped with a voltage-increase or decrease circuit (DC-DC converter) in the SRSCM in case the source voltage goes down or up. When the battery voltage is down or up the voltage-increase or decrease circuit (DC-DC converter) function will 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 B1111 or B1112 code, battery voltage too high or low is indicated. When voltage returns to normal, the SRS warning light automatically goes off and a malfunction is no longer indicated.
INSPECTION PROCEDURE
1. Preparation
1. Disconnect the negative (-) terminal cable from the battery, and wait at least 30 seconds.
2. Remove the DAB module.
3. Disconnect the connectors of the PAB, SAB, BPT and SIS.
4. Disconnect the SRSCM connector.
CAUTION: Place the DAB with the front surface facing upward.
2. Check source voltage.
1. Connect the negative (-) terminal cable to the battery
2. Turn the ignition switch ON.
CHECK: Measure voltage between the battery supply terminal 5 of the SRSCM connector and body ground.
LIMIT : 10 - 16 V
NG: Check the harness between the battery and the SRSCM. Check the battery and charging system
OK: continue to next step
3. Does the SRS warning light turn off?
PREPARATION
1. Turn the ignition switch to LOCK.
2. Install the DAB module.
3. Connect the connectors of the PAB, SAB, BPT and SIS.
4. Connect the SRSCM connector.
5. Turn the ignition switch ON.
CHECK: Check that the SRS warning light goes off.
NG: Check for DTCs. If a DTC is output, perform troubleshooting for the DTC. If B1111 or B1112 is output, replace the SRSCM.
OK: From the results of the above inspection, the malfunctioning part can now be considered normal.