DTC Troubleshooting: B1000
DTC B1000:
 Communication Bus Line Error
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch OFF, and then back ON (II).
  1. Wait for 6 seconds or more.
  1. Check for DTCs with the HDS.
Are DTC B1000, B1008, and B1011, and B1032 all indicated?
YES -
Go to Step 5 .
NO -
Intermittent failure. The communication bus line is OK at this time. Check for any worn/shorted wires.
  1. Turn the ignition switch OFF.
  1. Disconnect the appropriate connector at each control unit in the table.
    Control Unit
    Appropriate Connector
    MICU
    Under-dash fuse/relay box connector Q (16P)
    Gauge control module (tach)
    Connector (36P)
    Immobilizer-keyless control unit
    Connector (7P)
    Heater control unit/Climate control unit
    Connector (32P)
    Hands Free Telephone control unit
    Connector (22P)
    Automatic lighting/rain sensor
    Connector (5P)

  1. Turn the ignition switch ON (II).
  1. Clear the DTCs with the HDS.
  1. Turn the ignition switch OFF, and then back ON (II).
  1. Wait for 6 seconds or more.
  1. Check for DTCs with the HDS.
Are DTCs B1000, B1008, B1011, and B1032 all indicated?
YES -
Faulty MICU; replace the under-dash fuse/relay box. ■
NO -
Go to Step 12 .
  1. Turn the ignition switch OFF.
  1. Check for continuity between the under-dash fuse/relay box connector Q (16P) No. 6 terminal and body ground.
Is there continuity?
YES -
Repair a short to ground in the wire between the under-dash fuse/relay box connector and the affected control unit.■
NO -
Go to Step 14 .
  1. Turn the ignition switch ON (II).