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HOMESERVICE MANUALSHONDA2002CIVIC SIREPAIR AND DIAGNOSISEXTERNAL PAGESDIFFERENT CARSECTION 179 (EXTERIOR LIGHTS)AUTOMATIC LIGHTING CONTROL UNIT INPUT TEST

2002 Honda Civic Si

Automatic Lighting Control Unit Input Test

2002 Honda Civic SiSECTION Automatic Lighting Control Unit Input Test

WARNING: This page is about a different car, the 2006 Honda Odyssey and 2005 Honda Odyssey. However, it is still accessible from the selected car via links, so may be relevant.

Before testing the automatic lighting control functions, troubleshoot the multiplex integrated control system using B-CAN System Diagnosis Test Mode A (see TROUBLESHOOTING - B-CAN SYSTEM DIAGNOSIS TEST MODE A ).
Remove the driver's dashboard lower cover (see DRIVER'S DASHBOARD LOWER COVER REMOVAL/INSTALLATION ).
Disconnect the 14P connector (A) from the automatic lighting control unit (B).

Fig 1: Disconnect 14P Connector From Automatic Lighting Control Unit
Courtesy of AMERICAN HONDA MOTOR CO., INC.
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 5.

Reconnect the automatic lighting control unit connector, then make these input tests at the connector.

If any test indicates a problem, find and correct the cause, then recheck the system.
If all the inputs test prove OK, go to step 6.

AUTOMATIC LIGHTING CONTROL UNIT INPUT TEST DESCRIPTION (1 OF 2)

Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
8	BLK	Under all conditions	Check for voltage to ground: There should be less than 1 V.	Poor ground (G501) An open in the wire
9	BLK	Under all conditions	Check for voltage to ground: There should be less than 1 V.	Poor ground (G501) An open in the wire
1	BLK/YEL	Ignition switch ON (II)	Check for voltage to ground: There should be battery voltage.	Blown No. 30 (10 A) fuse in the driver's under-dash fuse/relay box Faulty driver's under-dash fuse/relay box Faulty passenger's under-dash fuse/relay box An open in the wire
7	YEL	Ignition switch ON (II)	Check for voltage to ground: There should be battery voltage.	Blown No. 21 (7.5 A) fuse in the driver's under-dash fuse/relay box Faulty driver's under-dash fuse/relay box An open in the wire
2	WHT	Ignition switch ON (II) and headlight switch ON	Check for voltage to ground: There should be less than 1 V.	An open in the wire
4	LT GRN	Under all conditions	Check for continuity between the No. 4 terminal and driver's under-dash fuse/relay box connector X (39P) No. 18 terminal: There should be continuity.	An open in the wire

Connect a voltmeter and jumper wires as shown in Fig 2, then turn the ignition switch ON (II) and make the input test at the connector.

If test indicates a problem, find and correct the cause, then recheck the system.
If the input test proves OK, replace the automatic lighting control unit.

Fig 2: Connecting Voltmeter And Jumper Wires

Courtesy of AMERICAN HONDA MOTOR CO., INC.

AUTOMATIC LIGHTING CONTROL UNIT INPUT TEST DESCRIPTION (2 OF 2)

Cavity	Wire	Test condition	Test: Desired result	Possible cause if result is not obtained
6	RED	Cover the automatic lighting sensor. (Cut the light off completely with a dark cloth.)	Check for voltage between the No. 6 terminal and body ground: There should be less than 1 V.	Faulty automatic lighting sensor An open in the wire
6	RED	Shine light on the automatic lighting sensor.	Check for voltage between the No. 6 terminal and body ground: There should be 5 V or more.	Faulty automatic lighting sensor An open in the wire

RENDER: 1.0x

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When to See a Mechanic

Stop DIY work and contact a certified mechanic immediately if any of the following apply:

• You smell fuel, burning insulation, or see smoke.
• Brakes feel soft, pull hard to one side, or make grinding noises.
• The engine overheats, stalls repeatedly, or misfires under load.
• You are missing required tools, torque specs, or safe lifting equipment.
• You are not confident in the next step or safety outcome.