DTC B1123
Precautions: Precautions for Diagnosing Trouble · Precautions for Replacing Ignition Key (Ignition Switch Model) · Precautions for Transmitter Disposal (Ignition Switch Model) · Precautions for Replacing Keyless Entry Control Module (Ignition Switch Model) · Precautions for Body, Cab and Accessories · General safety (00)
DTC Detecting Condition and Trouble Area
| DTC detecting condition | Trouble area |
|---|---|
|
B1123: Backup Power Supply Malfunction Backup power supply circuit voltage from “DOME” fuse is lower than specified value. |
•“DOME” fuse
•Each system connected to “DOME” fuse •Keyless entry control module |
DTC Confirmation Procedure
1)Set ignition “ON”.
DTC Troubleshooting
| Step | Action | Yes | No |
|---|---|---|---|
| 1 |
Fuse check
1)Check that ignition is “OFF”.
2)Check “DOME” fuse.
Is check result OK?
|
Replace keyless entry control module and recheck DTC.
|
Replace “DOME” fuse and go to Step 2.
|
| 2 |
DTC check
1)Set ignition “ON”.
2)Check DTC.
Is DTC B1123 still detected?
|
Go to Step 3.
|
End.
|
| 3 |
Each system check connected to “DOME” fuse
1)Check each system connected to “DOME” fuse, except keyless entry control module.
Is check result OK?
|
Replace “DOME” fuse and replace keyless entry control module, and recheck DTC.
|
Repair or replace defective part and/or wire harness, and then replace “DOME” fuse and recheck DTC.
|