Taillight Relay Circuit

LIGHTING: LIGHTING SYSTEM: Taillight Relay Circuit

Taillight Relay Circuit

DESCRIPTION

The main body ECU receives a light control switch TAIL signal from the headlight dimmer switch assembly, and turns the taillight relay on.

WIRING DIAGRAM









INSPECTION PROCEDURE

PROCEDURE

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

MAIN BODY (MAIN BODY ECU):





OK:
The taillight relay operates. (Taillights illuminate.)
OK -- PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE
NG -- Continue to next step.
2. INSPECT FUSE (TAIL)
(a) Remove the TAIL fuse from the instrument panel J/B assembly.
(b) Measure the resistance of the fuse.
Standard resistance:
Below 1 Ohms
NG -- REPLACE FUSE
OK -- Continue to next step.
3. INSPECT TAILLIGHT RELAY





(a) Remove the taillight relay from the instrument panel J/B assembly.
(b) Measure the resistance according to the value(s) in the table below.

Standard resistance:





NG -- REPLACE TAILLIGHT RELAY
OK -- Continue to next step.
4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY





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

Standard voltage:





OK -- REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND)
NG -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)





(a) Disconnect the IA instrument panel J/B assembly connector.
(b) Measure the voltage according to the value(s) in the table below.

Standard voltage:





NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY