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 > Touch Select 2-4 And High-low System: Invalid Data Received from Vehicle Dynamics Control Module (U0416)
DESCRIPTION This DTC is detected if a wheel speed malfunction signal is sent from the skid control ECU. DTC Code DTC Detection Condition Diagnosis Condition Malfunction Status Malfunction Time Other Trouble Area U0416 Ignition switch ON Wheel speed sensor malfunction signals from skid control ECU ar ...

Toyota Tundra Owners Manual