Toyota Tundra Service Manual: Inspection

INSPECTION

PROCEDURE

1. INSPECT TRAILER BRAKE CONTROL SWITCH

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

Standard Resistance:

Tester Connection	Switch Condition	Specified Condition
8 (SRF) -5 (SRRT)	-	2 kΩ to 3.09 kΩ
8 (SRF) -16 (SRW1)	Manual trailer brake output slider operated to maximum position (100%)	Below 1 kΩ
8 (SRF) -16 (SRW1)	Manual trailer brake output slider not operated (0%)	2 kΩ to 3 kΩ
8 (SRF) -14 (SRW2)	Manual trailer brake output slider operated to maximum position (100%)	2 kΩ to 3 kΩ
8 (SRF) -14 (SRW2)	Manual trailer brake output slider not operated (0%)	Below 1 kΩ
8 (SRF) -15 (SRR)	-	12 Ω to 14 Ω
4 (GA+) -6 (GND)	GAIN (+) selection button pressed	Below 20 Ω
4 (GA+) -6 (GND)	GAIN (+) selection button not pressed	100 kΩ or higher
4 (GA-) -6 (GND)	GAIN (-) selection button pressed	Below 20 Ω
4 (GA-) -6 (GND)	GAIN (-) selection button not pressed	100 kΩ or higher

If the result is not as specified, replace the trailer brake control switch.

*a	Component without harness connected (Trailer brake control switch)
*b	GAIN (+) selection button
*c	GAIN (-) selection button
*d	Manual trailer brake output slider

(b) Check that the LED illuminates.

(1) Apply battery voltage between the terminals of the trailer brake control switch, and check the illumination condition.

OK:

Measurement Condition

Switch Condition

Battery positive (+) →3 (TAIL)

Battery negative (-) → 1 (ILL-)

Illuminates

If the result is not as specified, replace the trailer brake control switch.

Component without harness connected

(Trailer brake control switch)

Indicator

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Toyota Tundra Owners Manual