Toyota Tundra (2015 year). Manual — part 2102
*: w/ Fog Light
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
OK
REPLACE MAIN BODY ECU
LIGHTING: LIGHTING SYSTEM: Light Control Switch Circuit; 201...
Last Modified: 9-16-2014
6.6 J
Doc ID: RM000002WKT01OX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: LIGHTING: LIGHTING SYSTEM: Headlight Signal Circuit; 2015 MY Tundra [08/2014 - ]
Headlight Signal Circuit
DESCRIPTION
The main body ECU receives a headlight Lo switch information signal from the light control switch, and
illuminates the headlight low beam.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
LIGHTING: LIGHTING SYSTEM: Headlight Signal Circuit; 2015 MY...
OK
Inspect the bulbs for circuits related to this system before performing the following inspection procedure.
PROCEDURE
1.
PERFORM ACTIVE TEST USING TECHSTREAM (HEADLIGHT)
(a) Operate the Techstream according to the steps on the display and select "Active Test".
Main Body ECU
TESTER DISPLAY
TEST PART
CONTROL RANGE
DIAGNOSTIC NOTE
Headlight
Headlight
ON or OFF
-
OK:
Headlight low beam turns on / turns off.
NG
GO TO STEP 2
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN
IN PROBLEM SYMPTOMS TABLE
2.
INSPECT FUSE (HEAD LL, HEAD RL)
(a) Remove the HEAD LL and HEAD RL fuses from the engine room junction block.
(b) Measure the resistance according to the value(s) in the table below.
Standard resistance:
TESTER CONNECTION
CONDITION
SPECIFIED CONDITION
HEAD LL fuse
Always
Below 1 Ω
HEAD RL fuse
NG
REPLACE FUSE
3.
CHECK HARNESS AND CONNECTOR (HEADLIGHT LOW BULB - BATTERY)
LIGHTING: LIGHTING SYSTEM: Headlight Signal Circuit; 2015 MY...
(a) for LH:
(1) Disconnect the A8 headlight connector.
(2) Measure the voltage according to the value(s) in the table below.
Standard voltage:
TESTER CONNECTION
SWITCH CONDITION
SPECIFIED CONDITION
A8-1 (LO) - Body ground
Light control switch HEAD, dimmer switch Low
11 to 14 V
Light control switch HEAD, dimmer switch except Low
Below 1 V
(b) for RH:
(1) Disconnect the A9 headlight connector.
(2) Measure the voltage according to the value(s) in the table below.
Standard voltage:
TESTER CONNECTION
SWITCH CONDITION
SPECIFIED CONDITION
A9-1 (LO) - Body ground
Light control switch HEAD, dimmer switch Low
11 to 14 V
Light control switch HEAD, dimmer switch except Low
Below 1 V
NG
GO TO STEP 4
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR
(HEADLIGHT LOW BULB - BODY GROUND)
4.
INSPECT HEADLIGHT RELAY (HEAD)
LIGHTING: LIGHTING SYSTEM: Headlight Signal Circuit; 2015 MY...
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