DTC B1000:

Communication Bus Line Error (BUS-OFF)

NOTE: If you are troubleshooting multiple DTCs, be sure to follow the instructions in B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).

Clear the DTCs with the HDS.
Turn the ignition switch OFF, and then back ON (II).
Wait for 6 seconds or more.
Check for DTCs with the HDS.
Is DTC B1000 indicated?

YES - Go to step 5.

NO - Intermittent failure. The communication bus line is OK at this time. Check for loose or poor connections, or worn/shorted wires. If the connections are good, check the battery condition (see BATTERY TEST ) and the charging system.
Check for DTCs with the HDS.
Are DTCs B1008, B1011, and B1032 also indicated with DTC B1000?

YES - Go to step 6.

NO - Faulty MICU; replace the under-dash fuse/relay box.
Turn the ignition switch OFF.

Disconnect the appropriate connector at each control unit in the table one at a time. Clear the DTCs, then recheck for DTCs after each unit is disconnected.

CONNECTOR SPECIFICATION

Control Unit	Appropriate Connector
Gauge control module	36P connector
Immobilizer-keyless control unit	7P connector
Climate control unit	Connector B (16P)
AcuraLink control unit	Connector B (16P)
HandsFreeLink control unit	22P connector
Power Seat Control Unit	Connector A (40P)

Is DTC B1000 indicated with each individual unit disconnected?

YES - Go to step 8.

NO - Replace the control unit that was disconnected and B1000 did not reset.

Disconnect under-dash fuse/relay box connector Q (16P).
Check for continuity between under-dash fuse/relay box connector Q (16P) No. 6 terminal and body ground.

Fig 1: Checking Continuity Between Under-Dash Fuse/Relay Box Connector Q (16P) No. 6 Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there continuity?

YES - Repair a short to ground in the wire.

NO - Go to step 10.
Turn the ignition switch ON (II).
Check for voltage between under-dash fuse/relay box connector Q (16P) No. 6 terminal and body ground.

Fig 2: Checking Voltage Between Under-Dash Fuse/Relay Box Connector Q (16P) No. 6 Terminal And Body Ground
Courtesy of AMERICAN HONDA MOTOR CO., INC.

Is there voltage?

YES - Repair a short to power in the wire between the under-dash fuse/relay box connector, the junction box, and the affected control unit.

NO - Faulty MICU; replace the under-dash fuse/ relay box.