DTC B1000: Communication Bus Line Error (BUS-OFF)

1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and then back to ON (II).
3. Wait for 6 seconds or more.
4. 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 (see CHARGING SYSTEM ). ■

5. Check for DTCs with the HDS.

   Are DTCs B1005, B1006, B1007, B1008, B1010, and B1011 also indicated? 

   YES  -Go to step 6.

   NO  -Faulty MICU; replace the under-dash fuse/relay box (see REMOVAL AND INSTALLATION ). ■

6. Turn the ignition switch to LOCK (0).
7. Disconnect the appropriate connector at each control unit in the table one at a time. Clear the DTC, then recheck for DTCs after each unit is disconnected.
   CONNECTOR REFERENCE CHART
   
   

   Control unit	Connector
   Gauge control module	Connector B(14P)
   Relay control module	Connector J (10P)
   Door multiplex control unit	Power window master switch connector (23P)
   Combination switch control unit	Connector (12P)
   HVAC control unit/Climate control unit	Connector (30P)
   HandsFreeLink control unit	Connector (28P)

   Is DTC B1000 indicated with each individual unit disconnected? 

   YES  -Go to step 8.

   NO  -Check the power and grounds to the control unit that was disconnected when B1000 did not reset. If OK, replace the control unit. ■

8. Disconnect each control unit connectors in the table.
   CONNECTOR REFERENCE CHART
   
   

   Control unit	Appropriate connector
   Gauge control module	Connector B(14P)
   Relay control module	Connector J (10P)
   Door multiplex control unit	Power window master switch connector (23P)
   Combination switch control unit	Connector (12P)
   HVAC control unit/Climate control unit	Connector (30P)
   HandsFreeLink control unit	Connector (28P)

9. Disconnect under-dash fuse/relay box connectors D (17P), J (21P), N (45P), X (39P), and P (30P).
10. Check for continuity between each of the under-dash fuse/relay box terminals listed in the table and body ground.
    CONNECTOR REFERENCE CHART
    
    

    Connected control unit	Under-dash fuse/relay box terminal
    Gauge control module	N28
    Relay control module	D11
    Door multiplex control unit	J4
    Combination switch control unit	X27
    HVAC control unit/Climate control unit	N22
    HandsFreeLink control unit	X18

    Is there continuity? 

    YES  -Repair the short to ground in the wire between the under-dash fuse/relay box and the affected control unit. ■

    NO  -Go to step 11.

11. Measure the voltage between each of the under-dash fuse/relay box terminals listed in the table and body ground.

Is there less than 0.2 V? 

YES  -Replace the under-dash fuse/relay box (see REMOVAL AND INSTALLATION ). ■

NO  -Repair a short to power in the wire between the under-dash fuse/relay box and the affected control unit. ■