On-Vehicle Inspection

WARNING: This page is about a different car, the 2006 Lexus IS 350 and 2006 Lexus IS 250. However, it is still accessible from the selected car via links, so may be relevant.

INSPECT REAR OUTER COMBINATION LIGHT ASSEMBLY

Disconnect the connector from the rear outer combination light.
Measure the voltage of the connector.

Standard voltage:

LH Side

SPECIFIED CONDITION AND TESTER CONNECTION

Tester Connection	Condition	Specified Condition
Q50-2 (STP) - Q50-6 (E)	Brake pedal released	Below 1 V
Q50-2 (STP) - Q50-6 (E)	Brake pedal depressed	10 to 14 V
Q50-3 (TL) - Q50-6 (E)	Dimmer switch ON	10 to 14 V
Q50-3 (TL) - Q50-6 (E)	Dimmer switch OFF	Below 1 V

RH Side

SPECIFIED CONDITION AND TESTER CONNECTION

Tester Connection	Condition	Specified Condition
Q51-2 (STP) - Q51-6 (E)	Brake pedal released	Below 1 V
Q51-2 (STP) - Q51-6 (E)	Brake pedal depressed	10 to 14 V
Q51-3 (TL) - Q51-6 (E)	Dimmer switch ON	10 to 14 V
Q51-3 (TL) - Q51-6 (E)	Dimmer switch OFF	Below 1 V

Fig 1: Identifying Rear Outer Combination Light Connector Terminal

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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

INSPECT REAR INNER COMBINATION LIGHT ASSEMBLY

Disconnect the connector from the rear inner combination light.
Measure the voltage of the connector.

Standard voltage:

LH Side

SPECIFIED CONDITION AND TESTER CONNECTION

Tester Connection	Condition	Specified Condition
Q40-1 - Q40-3	Dimmer switch ON	10 to 14 V
Q40-1 - Q40-3	Dimmer switch OFF	Below 1 V

RH Side

SPECIFIED CONDITION AND TESTER CONNECTION

Tester Connection	Condition	Specified Condition
Q46-1 - Q46-3	Dimmer switch ON	10 to 14 V
Q46-1 - Q46-3	Dimmer switch OFF	Below 1 V

Fig 2: Identifying Rear Inner Combination Light Connector Terminal

Courtesy of TOYOTA MOTOR SALES, U.S.A., INC.

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