Lighting System Headlight Relay Circuit

DESCRIPTION

WIRING DIAGRAM

INSPECTION PROCEDURE

PERFORM ACTIVE TEST USING INTELLIGENT TESTER

INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

CHECK HARNESS AND CONNECTOR (BATTERY - ENGINE ROOM J/B ASSEMBLY)

INSPECT ENGINE ROOM J/B BLOCK ASSEMBLY

CHECK HARNESS AND CONNECTOR (ENGINE ROOM J/B ASSEMBLY - INSTRUMENT PANEL J/B ASSEMBLY)

INSPECT ENGINE ROOM JUNCTION BLOCK ASSEMBLY

DESCRIPTION

HINT:

The headlight relays are built into the power distributor, so unlike conventional relays, they cannot be removed for inspection.

WIRING DIAGRAM

INSPECTION PROCEDURE

1. Connect the intelligent tester to the DLC3.
   

2. Turn the ignition switch to the ON position and turn the intelligent tester main switch on.
   

3. Select the item below in the ACTIVE TEST and then check that the relays operate.
   
   

   Main Body (Main Body ECU):

   Item	Test Details	Diagnostic Note
   HEAD RELAY	Headlight Relays ON / OFF	-

OK:

Headlight relays operate. (Low beam headlights illuminate.)

1. Measure the voltage according to the value(s) in the table below.
   

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   ID-3 (HRLY) - Body ground	Light control switch OFF → HEAD	10 to 14 V → Below 1 V

1. Disconnect the 1G engine room J/B assembly connector.
   

2. Measure the voltage according to the value(s) in the table below.
   

   Standard voltage:

   Tester Connector	Condition	Specified Condition
   1G - Body ground	Always	10 to 14 V

1. Reconnect the 1G engine room J/B assembly connector.
   

2. Disconnect the 1D engine room J/B assembly connector.
   

3. Measure the voltage according to the value(s) in the table below.
   

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   1D-9 - Body ground	Always	10 to 14 V

1. Reconnect the 1D engine room J/B assembly connectors.
   

2. Disconnect the ID instrument panel J/B assembly connector.
   

3. Measure the voltage according to the value(s) in the table below.
   

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   ID-3 (HRLY) - Body ground	Always	10 to 14 V

1. Remove the H-LP (RL) fuse and H-LP (LL) fuse from the engine room J/B assembly.
   

2. Measure the voltage between the loading slot of each fuse and body ground.
   

   Standard voltage:

   Tester Connection	Condition	Specified Condition
   H-LP (RL) Terminal - Body ground	Light control switch in HEAD	10 to 14 V
   H-LP (LL) Terminal - Body ground	Light control switch in HEAD	10 to 14 V