Test Mode 1

Check the PCM for DTCs and troubleshoot PCM (see GENERAL TROUBLESHOOTING INFORMATION ) or F-CAN loss of communication errors first, then perform this diagnosis if the HDS is not available.

1. Check the No. 7 (10 A) and No. 21 (10 A) fuses in the driver's under-dash fuse/relay box.

   Are the fuses OK? 

   YES  -Go to step 2.

   NO  -Find and repair the cause of the blown fuse.

2. Remove the left kick panel (see TRIM REMOVAL/INSTALLATION - DOOR AREAS ), and the driver's dashboard under cover.
3. Turn the ignition switch to ON (II), and move the interior lights switch to the "middle (door)" position.
4. Connect the MPCS service connector (A) to the multiplex control inspection connector socket (B) in the driver's under-dash fuse/relay box.
   Fig 1: Connecting MPCS Service Connector To Multiplex Control Inspection Connector Socket

   Courtesy of AMERICAN HONDA MOTOR CO., INC.
5. Wait 5 seconds, and watch the map lights. When the system enters Mode 1, the front and rear map lights will flash quickly once, and a double beep will be heard.
6. If there is a DTC, the map lights and ignition key light will blink, pause, then repeat the DTC as long as the ignition switch is turned to ON (II).

   Is there a repeating DTC? 

   YES  -Count the blinks, then go to step 7.

   NO  -Go to step 8 8.

7. About 1 second after you go into self-diagnostic Mode 1, the map lights will indicate the DTC, and repeat it every 3 seconds. If there is more than one DTC, the system will indicate them in ascending order, beginning with the DTC with the lowest numerical value. Troubleshoot the DTCs as indicated below:
   • DTC 2, 3, 4 and 5 simultaneously: Check for an open in the LT GRN wire between MICU D11 and relay control module J7, LT GRN wire between MICU N28 and combination switch control unit No. 4, LT GRN wire between MICU J4 and driver's MPCS unit A28, and LT GRN wire between MICU N22 and gauge control module B17. If the wire is OK, substitute a known-good driver's under-dash fuse/relay box, under-hood fuse/relay box, gauge control module, wiper/washer switch, and driver's MPCS unit one at a time, in that order, and recheck for the DTCs after each substitution.
   • DTC 1 only: Go to MICU input test (see MICU INPUT TEST ).
   • DTC 2 only (no other DTCs present): Go to the relay control module input test (see RELAY CONTROL MODULE INPUT TEST ). If all inputs are OK, substitute a known-good relay control module and then a MICU, one at a time, and then check for DTCs. If a DTC recurs after a substitution, replace that unit.
   • DTC 3 only (no other DTCs present): Go to the driver's MPCS unit input test (see DRIVER'S MPCS UNIT INPUT TEST ). If all inputs are OK, substitute a known-good driver's MPCS unit and then a MICU, one at a time, and then check for DTCs. If a DTC recurs after a substitution, replace that unit.
   • DTC 4 only (no other DTCs present): Go to the combination switch control unit input test (see COMBINATION SWITCH CONTROL UNIT INPUT TEST ). If all inputs are OK, substitute a known-good wiper/washer switch and then a MICU, one at a time, and then check for DTCs. If a DTC recurs after a substitution, replace that unit.
   • DTC 5 only (no other DTCs present): Go to the gauge control module input test (see GAUGE CONTROL MODULE INPUT TEST ). If all inputs are OK, substitute a known-good gauge control module and then a MICU, one at a time, and then check for DTCs. If a DTC recurs after a substitution, replace that unit.
   DTC REFERENCE CHART
   
   

   DTC	Cause
   1	The MICU cannot receive signals from the BUS communication line.
   2	The MICU cannot receive signals from the relay control module communication line.
   3	The MICU cannot receive signals from the driver's MPCS communication line.
   4	The MICU cannot receive signals from the combination switch communication line.
   5	The MICU cannot receive signals from the gauge control module.

8. Check for B-CAN DTCs indicated by the gauge control module (see GENERAL TROUBLESHOOTING INFORMATION ).

   Are any DTCs indicated? 

   YES  -Go to step 9.

   NO  -Go to step 11 1.

9. Record all DTCs and sort them by type using the DTC Troubleshooting.
10. Troubleshoot the DTCs in these order:
    • Battery voltage DTCs
    • Internal error DTCs
    • Loss of communication DTCs (begin with the lowest number first; for example, if DTC B1005 and B1008 are retrieved, troubleshoot B1005 first)
    • Signal error DTCs