Taillight Relay Circuit

DESCRIPTION

The body ECU controls TAIL relay when the signal is received from the headlight dimmer switch assembly.

WIRING DIAGRAM

INSPECTION PROCEDURE

1. PERFORM ACTIVE TEST BY INTELLIGENT TESTER

1. Connect the intelligent tester to the DLC3.

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

3. Select the items below in the ACTIVE TEST and then check that the relay operates.

   BODY NO.1 

   Item	Test Details	Diagnostic Note
   Taillight Relay	Turn Tail light relay ON/OFF	-

NG	Go to step 2

OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

2. INSPECT FUSE

1. Inspect TAIL fuse in the instrument panel junction block assembly.

   Resistance:

   Below 1 Ω
   

NG	REPLACE FUSE

OK

3. INSPECT RELAY

1. Inspect TAIL relay continuity.

   1. Remove the TAIL relay from the instrument panel J/B assembly.

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

      Resistance:

      Tester connection	Condition	Specified condition
      3 - 5	Always	10 kΩ or higher
      3 - 5	Apply B+ between the terminal 1 and 2	Below 1 Ω

NG	REPLACE RELAY

OK

4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (POWER SOURCE CIRCUIT)

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

   Voltage:

   Tester connection	Condition	Specified condition
   1A-1 - Body ground	Always	10 to 14 V

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR (BATTERY - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)

OK

5. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY

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

   Voltage:

   Tester connection	Condition	Specified condition
   1C-4 - Body ground	Light control switch OFF → TAIL	Below 1 V → 10 to 14 V
   1D-6 - Body ground	Light control switch OFF → TAIL	Below 1 V → 10 to 14 V
   1P-8 - Body ground	Light control switch OFF → TAIL	Below 1 V → 10 to 14 V

NG	PROCEED TO NEXT CIRCUIT INSPECTION SHOWN IN PROBLEM SYMPTOMS TABLE

OK

6. INSPECT REAR JUNCTION BLOCK

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

   Voltage:

   Tester connection	Condition	Specified condition
   5C-15 - Body ground	Light control switch OFF → TAIL	Below 1 V → 10 to 14 V

NG	REPAIR OR REPLACE HARNESS OR CONNECTOR (INSTRUMENT PANEL J/B ASSEMBLY - REAR JUNCTION BLOCK)

OK

7. INSPECT REAR JUNCTION BLOCK

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

   Voltage:

   Tester connection	Condition	Specified condition
   5C-16 - Body ground	Headlight dimmer switch OFF → TAIL	Below 1 V → 10 to 14 V
   5D-5 - Body ground	Headlight dimmer switch OFF → TAIL	Below 1 V → 10 to 14 V
   5D-9 - Body ground	Headlight dimmer switch OFF → TAIL	Below 1 V → 10 to 14 V
   5D-10 - Body ground	Headlight dimmer switch OFF → TAIL	Below 1 V → 10 to 14 V
   5D-11 - Body ground	Headlight dimmer switch OFF → TAIL	Below 1 V → 10 to 14 V

NG	REPLACE REAR JUNCTION BLOCK

OK
REPAIR OR REPLACE HARNESS OR CONNECTOR