Go to step 11.
NO -
Repair a short to power in the wire between the rear fuse/relay box and the affected control unit.?
11. Check for continuity between under-dash fuse/relay box connector N (45P) terminal No. 22 and body ground.
Is there continuity?
YES -
Repair a short to ground in the wire.?
NO -
Go to step 12.
12. Turn the ignition switch to ON (II).
13. Measure the voltage between under-dash fuse/relay box connector N (45P) terminal No. 22 and body ground.
Is there battery voltage?
YES -
Repair a short to power in the wire.?
NO -
Faulty MICU, replace the under-dash fuse/relay box.?
B1001
DTC Troubleshooting: B1001, B1002
DTC B1001:
MICU Internal Error (CPU error)
