DTC Troubleshooting: B1177

DTC B1177:  Battery Voltage Abnormal (7.5 V)

1.Clear the DTCs with the HDS.

2.Turn the ignition switch OFF, and then back ON (II).

3.Check for DTCs with the HDS.

Is DTC B1177 indicated?


YES - Go to 8.


NO - Go to 4.


4.Clear the DTCs with the HDS.

5.Turn the ignition switch OFF, and then back ON (II).

6.Crank the engine.

7.Check for DTCs with the HDS.

Is DTC B1177 indicated?


YES - Go to 8.


NO - Intermittent failure. The gauge control module (tach) and power supply voltage (IG1) that is supplied to the gauge control module (tach) are OK at this time. The battery may have been discharged, and recovered.n

8.Check the battery and the charging system.

Is the battery condition normal and the charging system OK?


YES - Go to 9.


NO - The battery needs a recharge or replacement, or the charging system needs to be repaired.n


9.Turn the ignition switch ON (II).

10.With the gauge control module (tach) 36P connector still connected, check for voltage between the No. 17 terminal of the gauge control module (tach) 36P connector and body ground.

Is the voltage above 7.5 V?


YES - Replace the gauge control module (tach).n


NO - Repair an open or high resistance in the BRN wire between the ignition switch and the gauge control module (tach).n