Civic L4-1668cc 1.7L SOHC MFI (2003)
Information Bus: Testing and Inspection
Multiplex Control System Troubleshooting
Troubleshooting
Mode 1 Test
1. Remove the dashboard lower cover.
2. Check the No.9 (10 A) fuse in the under-hood fuse/relay box and the No.10 (7.5 A) fuse in the under-dash fuse/relay box.
Are the fuses OK?
YES - Go to step 2.
NO - Find and repair the cause of the blown fuse.
3. Turn the ignition switch ON (II). If the driver's seatbelt is unbuckled, the seatbelt reminder will chime 6 times.
4. Set the ceiling light to the center position and close all the doors.
5. Connect the special tool to the multiplex inspection connector.
6. After about 5 seconds the spotlight and ceiling light should come on for 2 seconds, go out, then blink on for 0.2 second to show the system is now
in mode 1.
Did the spotlight and ceiling light indicate mode 1?
YES - Go to step 8.
NO - Go to step 7.
7. Check for continuity between terminal 4 of the under-dash fuse/relay box connector J and body ground.
Is there continuity?
YES - Replace the under-dash fuse/relay box.
NO - Repair the open in the wire. If the wire is ok, repair G301.
8. If the are DTCs present, the spotlight and ceiling light will blink to indicate the DTC(s). If more than one DTC is present, the DTCs will be
displayed in ascending order. If there are not DTCs the spotlight and ceiling light will no blink again after the mode 1 indication.
