DTC Troubleshooting: B1177
DTC B1177:
 Abnormal Battery Voltage
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch OFF, and then back ON (II).
  1. Check for DTCs with the HDS.
Is DTC B1177 indicated?
YES -
Go to Step 8 .
NO -
Go to Step 4 .
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch OFF, and then back ON (II).
  1. Crank the engine.
  1. Check for DTCs with the HDS.
Is DTC B1177 indicated?
YES -
Go to Step 8 .
NO -
Intermittent failure. The gauge control module (tach) and power supply voltage (IG1) that is supplied to the gauge control module are OK at this time. The battery may have been discharged, and recovered.■
  1. Check the battery and the charging system.
Is the battery condition normal and the charging system OK?
YES -
Go to Step 9 .
NO -
Abnormal battery condition that needs a recharge or replacement, or a charging system repair.■
  1. Turn the ignition switch ON (II).
  1. With gauge control module (tach) 36P connector still connected, measure voltage between the gauge control module (tach) 36P connector No. 17 terminal and body ground.
Is there about 7.5 V or more?
YES -
Replace the gauge control module (tach). ■
NO -
Repair an open or high resistance in the LT BLU wire between the ignition switch and the gauge control module (tach).■