Lexus NX: On-vehicle Inspection

Lexus NX Service Manual / Vehicle Exterior / Lighting (ext) / Stop Light Switch / On-vehicle Inspection

ON-VEHICLE INSPECTION

PROCEDURE

1. INSPECT STOP LIGHT SWITCH ASSEMBLY

(a) Disconnect the stop light switch assembly connector.

*a	Front view of wire harness connector (to Stop Light Switch Assembly)

(b) Measure the voltage and resistance on the wire harness side connector according to the value(s) in the table below.

Standard Voltage:

Tester Connection	Condition	Specified Condition
A1-1 (B) - A1-3 (GND)	Always	11 to 14 V
A1-5 (B) - A1-3 (GND)	Always	11 to 14 V

Standard Resistance:

Tester Connection	Condition	Specified Condition
A1-3 (GND) - Body ground	Always	Below 1 Ω

If the result is not as specified, repair or replace the wire harness or connector.

(d) w/o Dynamic Radar Cruise Control System:

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A1-2 (L) - A1-3 (GND)	Brake pedal not depressed	0 to 1.5 V
A1-2 (L) - A1-3 (GND)	Brake pedal depressed	7.5 to 14 V
A1-4 (L) - A1-3 (GND)	Brake pedal not depressed	7.5 to 14 V
A1-4 (L) - A1-3 (GND)	Brake pedal depressed	0 to 1.5 V

If the result is not as specified, replace the stop light switch assembly.

*a	Component with harness connected (Stop Light Switch Assembly)

(e) w/ Dynamic Radar Cruise Control System:

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

Standard Voltage:

Tester Connection	Condition	Specified Condition
A1-2 (L) - A1-3 (GND)	Power switch off, brake pedal not depressed	0 to 1.5 V
A1-2 (L) - A1-3 (GND)	Power switch off, brake pedal depressed	7.5 to 14 V
A1-4 (L) - A1-3 (GND)	Power switch on (IG), brake pedal not depressed	7.5 to 14 V
A1-4 (L) - A1-3 (GND)	Power switch on (IG), brake pedal depressed	0 to 1.5 V

If the result is not as specified, replace the stop light switch assembly.

*a	Component with harness connected (Stop Light Switch Assembly)

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Check Bus 5 Line for Short to GND

DESCRIPTION There may be a short circuit between one of the CAN bus lines and GND when there is no resistance between terminal 15 (CA5H) of the central gateway ECU (network gateway ECU) and terminal 4 (CG) of the DLC3, or terminal 16 (CA5L) of the central gateway ECU (network gateway ECU) and termin

Lexus NX: On-vehicle Inspection

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Removal

Check Bus 5 Line for Short to GND