DRL Relay Circuit

LIGHTING SYSTEM: DRL Relay Circuit

DRL Relay Circuit

DESCRIPTION

The multiplex network body ECU controls the DIMMER, DRL No. 2 and DRL No. 4 relays.
The DIM, DRL No. 2 and DRL No. 4 relays installed in the power distributor.

WIRING DIAGRAM

INSPECTION PROCEDURE
HINT: Start the inspection from step 1 when using the intelligent tester, and start from step 2 when not using the intelligent tester.

PROCEDURE

1. PERFORM ACTIVE TEST USING INTELLIGENT TESTER
(a) Connect the intelligent tester to DLC3.
(b) Turn the ignition switch ON and push the intelligent tester main switch ON.
(c) Select the item below in the ACTIVE TEST and then check that the relay operates.

BODY NO. 1

NG -- CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
2. CHECK HARNESS AND CONNECTOR (POWER SOURCE CIRCUIT)

(a) Disconnect the connector from the J/B No.2 (power distributor).
(b) Measure the voltage according to the value(s) in the table below.
Voltage:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
3. CONFIRM MODEL
Result:
A
w/ DRL
B
w/o DRL
B -- CHECK MODE MONITOR TERMINAL (DIM RELAY)
A -- Continue to next step.
4. INSPECT DAY TIME RUNNING LIGHT RELAY NO.3 (DRL NO. 3 RELAY)

(a) Inspect DRL relay continuity.
(1) Check the resistance between the each of the terminals as shown in the table below.
Resistance:

NG -- REPLACE DAY TIME RUNNING LIGHT RELAY NO.3
OK -- Continue to next step.
5. CHECK MODE MONITOR TERMINAL (DRL NO. 2, DRL NO. 4 RELAY)
(a) Preparation
(1) Connect the connector.
(2) Remove the cover of the fusible link block assembly.
(3) Set the vehicle to the following condition.

- Ignition switch ON.
- Headlight dimmer switch HI (FLASH).
- Light control switch ON.
(b) Check voltage

(1) Measure the voltage between the Mode Monitor Terminal and body ground.
RESULT:

B -- CHECK MODE MONITOR TERMINAL (SHORT CIRCUIT DRIVEN SIDE BY RELAY)
A -- Continue to next step.
6. INSPECT JUNCTION BLOCK NO.2 (DRL NO. 2, DRL NO. 4 RELAY)
(a) Turn the ignition switch to OFF position.
(b) Remove the J/B No. 2.
(c) Inspect the DRL No. 2 relay.

(1) Connect the positive battery lead to terminal +B of the J/B No. 2 and the negative lead to terminal SGND, PGND.

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

(3) Connect the battery negative lead to terminal DRL of the J/B No.2.

(4) Measure the voltage according to the value(s) in the table below.
Voltage:

(d) Inspect the DRL No.4 relay.
(1) Connect terminal HRE and DRL with wire.

(2) Connect the positive battery lead to terminal +B of the J/B No.2 and the negative lead to terminal SGND, PGND.

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

(4) Connect the battery negative lead to terminal HRLY of the J/B No.2.

(5) Measure the voltage according to the value(s) in the table below.
Voltage:

NG -- REPLACE JUNCTION BLOCK NO.2
OK -- Continue to next step.
7. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSY (DRL SIGNAL CIRCUIT)
(a) Disconnect the connectors from the instrument panel J/B.

HINT: Reconnect the J/B No. 2 connector.
(b) Measure the voltage according to the value(s) in the table below.
Voltage:

B -- CHECK HARNESS AND CONNECTOR (J/B NO. 2 - INSTRUMENT PANEL J/B)
OK -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (J/B NO. 2 - BULB)

(a) Disconnect the connectors from the J/B No.2 (power distributor).

(b) Disconnect the connector from the headlight bulb.
(c) Measure the resistance according to the value(s) in the table below.
Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (BULB - J/B NO. 2)

(a) Disconnect the connectors from the J/B No.2 (power distributor).

(b) Measure the resistance according to the value(s) in the table below.
Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
10. CHECK HARNESS AND CONNECTOR (BULB - BODY GROUND)

(a) Measure the resistance according to the value(s) in the table below.
Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
11. CHECK HARNESS AND CONNECTOR (J/B NO. 2 - RELAY BLOCK NO. 3)
(a) Remove the DRL No.3 relay from the relay block No.3.

(b) Measure the resistance according to the value(s) in the table below.
Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
12. CHECK HARNESS AND CONNECTOR (J/B NO. 2 - INSTRUMENT PANEL J/B)

(a) Disconnect the connectors from the instrument panel J/B.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
13. CHECK MODE MONITOR TERMINAL (SHORT CIRCUIT DRIVEN SIDE BY RELAY)
(a) Connect the connectors.
(b) Remove the headlight bulbs.
(c) Ignition switch ON.
(d) Check voltage

(1) Measure the voltage between the Mode Monitor Terminal and body ground.
RESULT:

B -- REPAIR OR REPLACE HARNESS OR CONNECTOR
A -- REPLACE BULB
14. CHECK MODE MONITOR TERMINAL (DIM RELAY)
(a) Preparation
(1) Connect the connector.
(2) Remove the cover of the fusible link block assembly.
(3) Set the vehicle to the following condition.

- Ignition switch ON.
- Headlight dimmer switch HI (FLASH).
- Light control switch ON.
(b) Check voltage

(1) Measure the voltage between the Mode Monitor Terminal and body ground.
RESULT:

B -- CHECK HARNESS AND CONNECTOR (J/B NO. 2 - BULB)
A -- Continue to next step.
15. INSPECT JUNCTION BLOCK NO.2 (DIM RELAY)
(a) Turn the ignition switch to OFF position.
(b) Remove the J/B No. 2.
(c) Inspect the DRL relay.

(1) Connect the positive battery lead to terminal +B of the J/B No. 2 and the negative lead to terminal SGND, PGND.

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

(3) Connect the battery negative lead to terminal DRL of the J/B No. 2.

(4) Measure the voltage according to the value(s) in the table below.
Voltage:

NG -- REPLACE JUNCTION BLOCK NO.2
OK -- Continue to next step.
16. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSY (DRL SIGNAL CIRCUIT)
(a) Disconnect the connector from the instrument panel J/B.

HINT: Reconnect the J/B No. 2 connector.
(b) Measure the voltage according to the value(s) in the table below.
Voltage:

NG -- CHECK HARNESS AND CONNECTOR (J/B NO. 2 - INSTRUMENT PANEL J/B)
OK -- Continue to next step.
17. CHECK HARNESS AND CONNECTOR (J/B NO. 2 - BULB)

(a) Disconnect the connectors from the J/B No. 2 (power distributor).

(b) Disconnect the connector from the headlight bulb.
(c) Measure the resistance according to the value(s) in the table below.
Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
18. CHECK HARNESS AND CONNECTOR (BULB - BODY GROUND)

(a) Measure the resistance according to the value(s) in the table below.
Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE JUNCTION BLOCK NO.2
19. CHECK HARNESS AND CONNECTOR (J/B NO. 2 - INSTRUMENT PANEL J/B)

(a) Disconnect the connectors from the instrument panel J/B.
(b) Measure the resistance according to the value(s) in the table below.
Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
20. CHECK HARNESS AND CONNECTOR (J/B NO. 2 - BULB)

(a) Disconnect the connectors from the J/B No. 2 (power distributor) and headlight bulb.

(b) Disconnect the connector from the headlight bulb.
(c) Measure the resistance according to the value(s) in the table below.
Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
21. CHECK HARNESS AND CONNECTOR (BULB - BODY GROUND)

(a) Measure the resistance according to the value(s) in the table below.
Resistance:

NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE JUNCTION BLOCK NO.2