Interior Lights Systems: Diagnosis Honda Pilot I

Ignition Key Switch Test

Note. For more key-in beeper information, refer to the circuit diagram (see CIRCUIT DIAGRAM ) and input test (see CONTROL UNIT INPUT TEST ).

When the ignition key is in the ignition switch, the key-in beeper in the driver's multiplex control unit senses ground through the closed ignition key switch. When you open the driver's door, the beeper circuit senses ground through the closed door switch.

1. Remove the steering column upper and lower cover (see «STEERING COLUMN REMOVAL & INSTALLATION»(ref-174024-S02398063972005041500000) ).
2. Disconnect the 7P connector.
3. Check for continuity between the No. 1 and No. 3 terminals: There should be continuity with the key in the ignition switch. There should be no continuity with the key removed.
4. If the continuity is not as specified, replace the ignition key switch.

Ignition Key Light Test

1. Remove the steering column upper and lower covers (see «STEERING COLUMN REMOVAL & INSTALLATION»(ref-174024-S02398063972005041500000) ).
2. Disconnect the 7P connector.
3. The LED should come on when power is connected to the No. 7 terminal and ground is connected to No. 6 terminal.
4. If the LED does not come on, replace the ignition key switch.

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1. Before testing the entry light control functions, troubleshoot the multiplex control system (see page «TROUBLESHOOTING»(ref-174054-S13252150322005051900000) ). Driver's Multiplex Control Unit
2. Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box.
3. Inspect the connector and socket terminals to be sure they are all making good contact: If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system. If the terminals look OK, go to step 4.
4. With the driver's multiplex control unit still disconnected, make these input tests at the connector or driver's under-dash fuse-relay box socket: If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, go to step 5.
5. Reconnect the driver's multiplex control unit to the driver's under-dash fuse/relay box, and perform the following input tests at the appropriate connectors on the back of the driver's under-dash fuse/relay box. For driver's under-dash fuse/relay box connector socket location (see «FUSES & CIRCUIT BREAKERS»(ref-163176) ). If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, go to step 6. Passenger's Multiplex Control Unit
6. Remove the passenger's multiplex control unit from the passenger's under-dash fuse/relay box, and disconnect its connector.
7. Inspect the connector and socket terminals to be sure they are all making good contact: If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system. If the terminals look OK, go to step 8.
8. With the passenger's multiplex control unit still disconnected, make these input tests at the connector and passenger's under-dash fuse/relay box socket. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input test prove OK, go to step 9.
9. Reconnect the passenger's multiplex control unit to the passenger's under-dash fuse/relay box, and perform the following input tests at the appropriate connector of the passenger's under-dash fuse/relay box. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, go to step 10. Door Multiplex Control Unit
10. Remove the driver's door panel and disconnect the 20P connector from the door multiplex control unit.
11. Inspect the connector and socket terminals to be sure they are all making good contact: If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system. If the terminals look OK, go to step 12.
12. Reconnect the connector to the door multiplex control unit, and make the input test at the connector: If a test indicates a problem, find and correct the cause, then recheck the system. If the input test proves OK, go to step 13.
13. If all the input tests prove OK, one of the control units must be faulty. Substitute a known-good control unit for the one that is most likely at fault, then recheck the system. If the system works properly, the original control unit is faulty; replace it. If there is still a malfunction, substitute a known-good control unit for the next most likely unit to be at fault, and recheck. If the system works properly, the original unit is faulty. Replace unit.

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1. Remove the driver's multiplex control unit from the driver's under-dash fuse/relay box.
2. Inspect the connector and socket terminals to be sure they are all making good contact: If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system. If the terminals look OK, go to step 3.
3. With the driver's multiplex control unit still disconnected, make these input tests at the connector and driver's under-dash fuse/relay box socket. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, go to step 4.
4. Reconnect the driver's multiplex control unit to the driver's under-dash fuse/relay box, and perform the following input tests at the appropriate connectors on the driver's under-dash fuse/relay box. If any test indicates a problem, find and correct the cause, then recheck the system. If all the input tests prove OK, the driver's multiplex control unit must be faulty; replace it.

Scheme 38

1. Before testing the controller, do the control unit input test (see «CONTROL UNIT INPUT TEST»(ref-174045-S07344923252005051400000) ).
2. Remove the gauge assembly (A) (see «GAUGE ASSEMBLY REPLACEMENT»(ref-174043-S28942063882005050300000) ).
3. Disconnect the 30P connector (B).
4. At the gauge assembly 30P connector A, measure resistance between the No. 19 and No. 18 terminals while rotating the adjusting dial. Resistance should vary from 0 to 20,000 ohm as the dial is rotated.
5. If the resistance is not as specified, replace the gauge assembly.