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

Toyota Tundra Service Manual > Vehicle Stability Control System: Brake Pedal Load Sensing Switch OFF Stuck Malfunction (C1430,C1431)
DESCRIPTION The brake pedal load sensing switch turns on when the brake pedal is depressed with a force exceeding a predetermined level. The skid control ECU uses this circuit to detect if the brake pedal is depressed or not. DTC No. Detection Item DTC Detection Condition Trouble Area C1430 Brake Pe ...

Toyota Tundra Owners Manual