Toyota Tundra (2015 year). Manual — part 2094
Last Modified: 9-16-2014
6.6 J
Doc ID: RM000002WL601OX
Model Year: 2015
Model: Tundra
Prod Date Range: [08/2014 - ]
Title: LIGHTING: LIGHTING SYSTEM: Headlight (HI-BEAM) Circuit; 2015 MY Tundra [08/2014 - ]
Headlight (HI-BEAM) Circuit
DESCRIPTION
The main body ECU receives light control switch and dimmer switch information signals from the headlight
dimmer switch, and illuminates the headlight high beam.
WIRING DIAGRAM
INSPECTION PROCEDURE
HINT:
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
LIGHTING: LIGHTING SYSTEM: Headlight (HI-BEAM) Circuit; 20...
OK
TESTER DISPLAY
TEST PART
CONTROL RANGE
DIAGNOSTIC NOTE
Head Light Hi
Headlight (High)
ON or OFF
-
OK:
Headlight (High) turns on / turns off.
NG
GO TO STEP 2
OK
PROCEED TO NEXT CIRCUIT INSPECTION SHOWN
IN PROBLEM SYMPTOMS TABLE
2.
INSPECT FUSE (HEAD LH, HEAD RH)
(a) Remove the HEAD LH and HEAD RH 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 LH fuse
Always
Below 1 Ω
HEAD RH fuse
NG
REPLACE FUSE
3.
CHECK HARNESS AND CONNECTOR (HEADLIGHT HIGH BULB - BATTERY)
(a) for LH:
(1) Disconnect the A8 headlight connector.
(2) Measure the voltage according to the value(s) in the table below.
LIGHTING: LIGHTING SYSTEM: Headlight (HI-BEAM) Circuit; 20...
Standard voltage:
TESTER CONNECTION
SWITCH CONDITION
SPECIFIED CONDITION
A8-2 (HI) - Body ground
Light control switch HEAD, dimmer switch High
11 to 14 V
Light control switch HEAD, dimmer switch except High
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
A9-2 (HI) - Body ground
Light control switch HEAD, dimmer switch High
11 to 14 V
Light control switch HEAD, dimmer switch except High
Below 1 V
NG
GO TO STEP 4
OK
REPAIR OR REPLACE HARNESS OR CONNECTOR
(HEADLIGHT HIGH BULB - BODY GROUND)
4.
INSPECT HEADLIGHT DIMMER RELAY (DIM)
(a) Remove the headlight dimmer relay from the engine room
relay block.
(b) Measure the resistance according to the value(s) in the table
below.
Standard resistance:
TESTER
CONNECTION
CONDITION
SPECIFIED
CONDITION
3 - 5
Battery voltage not applied to
terminals 1 and 2
10 kΩ or higher
LIGHTING: LIGHTING SYSTEM: Headlight (HI-BEAM) Circuit; 20...
OK
OK
TESTER
CONNECTION
CONDITION
SPECIFIED
CONDITION
Battery voltage applied to
terminals 1 and 2
Below 1 Ω
3 - 4
Battery voltage not applied to
terminals 1 and 2
Below 1 Ω
Battery voltage applied to
terminals 1 and 2
10 kΩ or higher
NG
REPLACE HEADLIGHT DIMMER RELAY
5.
CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - BATTERY)
(a) Remove the headlight dimmer relay from the engine room
relay block.
(b) Measure the voltage according to the value(s) in the table
below.
Standard voltage:
TESTER CONNECTION
SWITCH CONDITION
SPECIFIED
CONDITION
Headlight dimmer relay
terminal 1 - Body ground
Light control switch
HEAD, dimmer switch
High
11 to 14 V
Headlight dimmer relay
terminal 3 - Body ground
Light control switch
HEAD, dimmer switch
High
NG
REPAIR OR REPLACE HARNESS OR CONNECTOR
6.
CHECK HARNESS AND CONNECTOR (HEADLIGHT DIMMER RELAY - HEADLIGHT HIGH
LIGHTING: LIGHTING SYSTEM: Headlight (HI-BEAM) Circuit; 20...
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