Daytime running light does not come on

NOTE:  Refer to the Electrical Wiring Diagrams for the location of the under-dash fuse/relay box connector.

• 1. Problem verification:

  - 1. Turn the vehicle to the ON mode.

  - 2. Turn the combination light switch to the OFF position.

  Do the both daytime running lights come on?

  YES 

  Intermittent failure, the system is OK at this time. Check for loose or poor connections.

  NO 

  Go to step 2.

• 2. Daytime running light system check 1:

  - 1. Check the parameter(s) below with the HDS.

  When the combination light switch is turned OFF 

  Signal	Threshold		Current conditions
  	Values	Unit	Values	Unit
  Headlight Switch (OFF)	ON
  Headlight Switch (SMALL)	OFF
  Headlight Switch (AUTO)	OFF
  Headlight Switch (HEADLIGHT)	OFF

  When the combination light switch is turned to POSITION (SMALL) 

  Signal	Threshold		Current conditions
  	Values	Unit	Values	Unit
  Headlight Switch (OFF)	OFF
  Headlight Switch (SMALL)	ON
  Headlight Switch (AUTO)	OFF
  Headlight Switch (HEADLIGHT)	OFF

  When the combination light switch is turned to AUTO 

  Signal	Threshold		Current conditions
  	Values	Unit	Values	Unit
  Headlight Switch (OFF)	OFF
  Headlight Switch (SMALL)	OFF
  Headlight Switch (AUTO)	ON
  Headlight Switch (HEADLIGHT)	OFF

  When the combination light switch is turned ON (HEADLIGHT) 

  Signal	Threshold		Current conditions
  	Values	Unit	Values	Unit
  Headlight Switch (OFF)	OFF
  Headlight Switch (SMALL)	ON
  Headlight Switch (AUTO)	OFF
  Headlight Switch (HEADLIGHT)	ON

  Are all data list values correct?

  YES 

  Go to step 8.

  NO 

  Go to step 3.

• 3. Daytime running light system check 2:

  - 1. Check the parameter(s) below with the HDS.

  When the combination light switch is turned OFF 

  Signal	Threshold		Current conditions
  	Values	Unit	Values	Unit
  Headlight Switch (OFF)	ON
  Headlight Switch (SMALL)	OFF
  Headlight Switch (AUTO)	OFF
  Headlight Switch (HEADLIGHT)	OFF

  When the combination light switch is turned to POSITION (SMALL) 

  Signal	Threshold		Current conditions
  	Values	Unit	Values	Unit
  Headlight Switch (OFF)	OFF
  Headlight Switch (SMALL)	ON
  Headlight Switch (AUTO)	OFF
  Headlight Switch (HEADLIGHT)	OFF

  When the combination light switch is turned to AUTO 

  Signal	Threshold		Current conditions
  	Values	Unit	Values	Unit
  Headlight Switch (OFF)	OFF
  Headlight Switch (SMALL)	OFF
  Headlight Switch (AUTO)	ON
  Headlight Switch (HEADLIGHT)	OFF

  When the combination light switch is turned ON (HEADLIGHT) 

  Signal	Threshold		Current conditions
  	Values	Unit	Values	Unit
  Headlight Switch (OFF)	OFF
  Headlight Switch (SMALL)	ON
  Headlight Switch (AUTO)	OFF
  Headlight Switch (HEADLIGHT)	ON

  Is the data list value not ON, but OFF?

  YES 

  Go to step 6.

  NO 

  Go to step 4.

• 4. Daytime running light system check 3:

  - 1. Turn the vehicle to the OFF (LOCK) mode.

  - 2. Disconnect the following connector.

  Combination light switch 12P connector

  - 3. Check the parameter(s) below with the HDS.

  When the combination light switch is turned OFF 

  Signal	Threshold		Current conditions
  	Values	Unit	Values	Unit
  Headlight Switch (OFF)	ON
  Headlight Switch (SMALL)	OFF
  Headlight Switch (AUTO)	OFF
  Headlight Switch (HEADLIGHT)	OFF

  When the combination light switch is turned to POSITION (SMALL) 

  Signal	Threshold		Current conditions
  	Values	Unit	Values	Unit
  Headlight Switch (OFF)	OFF
  Headlight Switch (SMALL)	ON
  Headlight Switch (AUTO)	OFF
  Headlight Switch (HEADLIGHT)	OFF

  When the combination light switch is turned to AUTO 

  Signal	Threshold		Current conditions
  	Values	Unit	Values	Unit
  Headlight Switch (OFF)	OFF
  Headlight Switch (SMALL)	OFF
  Headlight Switch (AUTO)	ON
  Headlight Switch (HEADLIGHT)	OFF

  When the combination light switch is turned ON (HEADLIGHT) 

  Signal	Threshold		Current conditions
  	Values	Unit	Values	Unit
  Headlight Switch (OFF)	OFF
  Headlight Switch (SMALL)	ON
  Headlight Switch (AUTO)	OFF
  Headlight Switch (HEADLIGHT)	ON

  Is data list value changed from ON to OFF?

  YES 

  Replace the combination light switch .

  NG

  Go to step 5.

• 5. Shorted wire check (H/L ON SW, SMALL LT SW lines):

  - 1. Turn the vehicle to the OFF (LOCK) mode.

  - 2. Disconnect the following connector(s).

  Under-dash fuse/relay box connector T (20P) Automatic lighting/rain sensor 5P connector*1 Automatic lighting control unit/sensor 7P connector*2 *1: With automatic lighting and automatic wiper *2: With automatic lighting except automatic wiper

  - 3. Check for continuity between test points 1 and 2 individually.

  Test condition	Vehicle OFF (LOCK) mode Combination light switch 12P connector: disconnected Under-dash fuse/relay box connector T (20P): disconnected Automatic lighting/rain sensor 5P connector*1 Automatic lighting control unit/sensor 7P connector*2 *1: With automatic lighting and automatic wiper *2: With automatic lighting except automatic wiper
  Test point 1	Under-dash fuse/relay box connector T (20P) No. 2
  Test point 2	Body ground

  Test point 1	Under-dash fuse/relay box connector T (20P) No. 3
  Test point 2	Body ground

  Is there continuity?

  YES 

  Repair a short to ground in the wire.

  NO 

  Faulty MICU; replace the under-dash fuse/relay box .

• 6. Daytime running light system check 3:

  - 1. Connect terminals A and B with jumper wires.

  Terminal A	Combination light switch 12P connector No. 7
  Terminal B	Body ground

  Terminal A	Combination light switch 12P connector No. 8
  Terminal B	Body ground

  Courtesy of HONDA, U.S.A., INC.

  Is data list value changed from OFF to ON?

  YES 

  Replace the combination light switch .

  NO 

  Go to step 7.

• 7. Open wire check (H/L ON SW, SMALL LT SW, COMBI SW GND (LT) lines):

  - 1. Turn the vehicle to the OFF (LOCK) mode.

  - 2. Disconnect the following connectors.

  Under-dash fuse/relay box connector T (20P) Combination light switch 12P connector

  - 3. Check for continuity between test points 1 and 2 individually.

  Test condition	Vehicle OFF (LOCK) mode Under-dash fuse/relay box connector T (20P): disconnected Combination light switch 12P connector: disconnected
  Test point 1	Under-dash fuse/relay box connector T (20P) No. 2
  Test point 2	Combination light switch 12P connector No. 7

  Test point 1	Under-dash fuse/relay box connector T (20P) No. 3
  Test point 2	Combination light switch 12P connector No. 8

  Test point 1	Under-dash fuse/relay box connector T (20P) No. 5
  Test point 2	Combination light switch 12P connector No. 6

  Courtesy of HONDA, U.S.A., INC.

  Is there continuity?

  YES 

  Faulty MICU; replace the under-dash fuse/relay box .

  NO 

  Repair an open or high resistance in the wire.

• 8. Fuse check:

  - 1. Check the following fuse.

  Fuse	No. A19 (10 A)
  Location	Under-hood fuse/relay box

  Is the fuse OK?

  YES 

  Go to step 9.

  NO 

  Replace the fuse, and recheck. If the fuse blows again, repair a short in the No. A19 (10 A) fuse circuit.

• 9. Daytime running light relay check:

  - 1. Turn the vehicle to the OFF (LOCK) mode.

  - 2. Remove the daytime running light relay, and test it .

  Is the relay OK?

  YES 

  Go to step 10.

  NO 

  Replace the daytime running light relay, then recheck.

• 10.Open wire check (+B DRL line):

  - 1. Measure the voltage between test points 1 and 2 individually.

  Test condition	Vehicle OFF (LOCK) mode Daytime running light relay: disconnected
  Test point 1	Daytime running light relay 4P socket No. 1
  Test point 2	Body ground

  Test point 1	Daytime running light relay 4P socket No. 3
  Test point 2	Body ground

  Courtesy of HONDA, U.S.A., INC.

  Is there battery voltage?

  YES 

  +B DRL wire is OK. Go to step 11.

  NO 

  Repair an open or high resistance in the wire.

• 11.Determine possible failure area (daytime running light relay switch side circuit, daytime running light relay coil side circuit):

  - 1. Connect terminals A and B with a jumper wire.

  Terminal A	Daytime running light relay 4P socket No. 1
  Terminal B	Daytime running light relay 4P socket No. 2

  Courtesy of HONDA, U.S.A., INC.

  Does the daytime running lights come on?

  YES 

  Go to step 14.

  NO 

  Go to step 12.

• 12.Open wire check (DRL RLY OUT line):

  - 1. Disconnect the following connectors.

  Left/Right daytime running light/front parking light 3P connectors

  - 2. Check for continuity between test points 1 and 2 individually.

  Test condition	Vehicle OFF (LOCK) mode Daytime running light relay: disconnected Left/Right daytime running light/front parking light 3P connectors: disconnected
  Test point 1	Daytime running light relay 4P socket No. 2
  Test point 2	Left/Right daytime running light/front parking light 3P connector No. 2

  Courtesy of HONDA, U.S.A., INC.

  Courtesy of HONDA, U.S.A., INC.

  Is there continuity?

  YES 

  DRL RLY OUT wire is OK. Go to step 13.

  NO 

  Repair an open or high resistance in the wire.

• 13.Open wire check (GND line):

  - 1. Check for continuity between test points 1 and 2 individually.

  Test condition	Vehicle OFF (LOCK) mode Daytime running light relay: disconnected Left/Right daytime running light/front parking light 3P connectors: disconnected
  Test point 1	Left/Right daytime running light/front parking light 3P connectors No. 1
  Test point 2	Body ground

  Courtesy of HONDA, U.S.A., INC.

  Is there continuity?

  YES 

  The GND wire is OK. Replace the headlight assy .

  NO 

  Repair an open or high resistance in the wire or poor ground (G301).

• 14.Open wire check (DRL RLY CL- line):

  - 1. Disconnect the following connector.

  Under-dash fuse/relay box connector C (38P)

  - 2. Check for continuity between test points 1 and 2.

  Test condition	Vehicle OFF (LOCK) mode Daytime running light relay: disconnected Under-dash fuse/relay box connector C (38P): disconnected
  Test point 1	Under-dash fuse/relay box connector C (38P) No. 29
  Test point 2	Daytime running light relay 4P socket No. 4

  Courtesy of HONDA, U.S.A., INC.

  Is there continuity?

  YES 

  Faulty MICU; replace the under-dash fuse/relay box .

  NO 

  Repair an open or high resistance in the wire.