Honda Civic. Manual — part 935

Is there battery voltage?

YES - Go to step 10.

NO - Check the No. 23 (10 A) fuse in the under-hood fuse/relay box. If the
fuse is blown, replace the fuse and repair a short to ground in the wire. If the
fuse is OK, repair an open in the wire.

10. Disconnect the ignition key switch 6P connector.
11. At the ignition key switch side, check for continuity between the ignition key

switch 6P connector No. 1 and No. 2 terminals.

Fig. 17: Checking Continuity Between Ignition Key Switch 6P Connector
No. 1 And No. 2 Terminals

Is there continuity?

YES - Faulty ignition key switch or short to ground, replace the steering lock
assembly.

NO - Go to step 12.

12. Insert the ignition key into the ignition switch.
13. At the ignition key switch side, check for continuity between the ignition key

switch 6P connector No. 1 and No. 2 terminals.

2008 Honda Civic LX

2006-08 ACCESSORIES & EQUIPMENT Keyless/Power Door Locks/Security System - Civic (All Except Hybrid)

Fig. 18: Checking Continuity Between Ignition Key Switch 6P Connector
No. 1 And No. 2 Terminals

Is there continuity?

YES - Go to step 14.

NO - Faulty ignition key switch, replace the steering lock assembly.

14. Check for continuity between the immobilizer-keyless control unit 7P

connector No. 6 terminal and the ignition key switch 6P connector No. 1
terminal.

Fig. 19: Checking Continuity Between Immobilizer-Keyless Control Unit
7P Connector No. 6 Terminal And Ignition Key Switch 6P Connector No.
1 Terminal

Is there continuity?

YES - Go to step 15.

2008 Honda Civic LX

2006-08 ACCESSORIES & EQUIPMENT Keyless/Power Door Locks/Security System - Civic (All Except Hybrid)

NO - Repair an open in the wire.

15. Check for continuity between the immobilizer-keyless control unit 7P

connector No. 6 terminal and body ground.

Fig. 20: Checking Continuity Between Immobilizer-Keyless Control Unit
7P Connector No. 6 Terminal And Body Ground

Is there continuity?

YES - Repair a short to ground in the wire.

NO - Replace the immobilizer-keyless control unit.

DOORS WILL NOT UNLOCK (OR LOCK) WITH THE TRANSMITTER, BUT WILL UNLOCK
(LOCK) WITH THE DOOR SWITCH

1. Turn the ignition switch OFF.
2. Remove the ignition key from the ignition switch.
3. Close and lock the doors.
4. Try to lock/unlock the doors with the keyless transmitter.

Do the door lock actuators work normally?

YES - Intermittent failure. The system is OK at this time.

NOTE:

Before troubleshooting, check the B-CAN DTCs. If any DTC
is indicated, troubleshoot the indicated DTC first.

2008 Honda Civic LX

2006-08 ACCESSORIES & EQUIPMENT Keyless/Power Door Locks/Security System - Civic (All Except Hybrid)

NO - Go to step 5.

5. Open the driver's door.

Does the key-in reminder chime sound?

YES - Faulty ignition key switch, or short to ground on the ignition switch
PNK wire. Repair as necessary.

NO - Go to step 6.

6. Do the transmitter test (see TRANSMITTER TEST/REPLACEMENT ).

Is the transmitter OK?

YES - Substitute a known-good MICU and recheck.

NO - Replace the transmitter.

THE HORN DOES NOT SOUND WHEN THE PANIC BUTTON ON THE TRANSMITTER IS
PRESSED

1. Press the PANIC button.

Does the horn sound?

YES - Go to step 3.

NO - Go to step 2.

2. Press the horn button.

Does the horn sound?

YES - Go to step 3.

NOTE:

Before troubleshooting, check the B-CAN DTCs. If any DTC
is indicated, troubleshoot the indicated DTC first.

2008 Honda Civic LX

2006-08 ACCESSORIES & EQUIPMENT Keyless/Power Door Locks/Security System - Civic (All Except Hybrid)