Toyota Avalon (XX50) 2019-2022 Service & Repair Manual: Inspection

INSPECTION

PROCEDURE

1. INSPECT HEADLIGHT ASSEMBLY LH (w/o Cornering Light)

(a) Apply auxiliary battery voltage to the headlight assembly LH and check that the lights illuminate.

OK:

Measurement Condition	Specified Condition
Auxiliary battery positive (+) → Terminal 4 (LO) Auxiliary battery negative (-) → Terminal 7 (E)	Lo beam headlight illuminates
Auxiliary battery positive (+) → Terminal 3 (HI) Auxiliary battery negative (-) → Terminal 7 (E)	Hi beam headlight illuminates
Auxiliary battery positive (+) → Terminal 1 (B) Auxiliary battery positive (+) → Terminal 4 (LO) Auxiliary battery negative (-) → Terminal 7 (E)	Daytime running light illuminates
Auxiliary battery positive (+) → Terminal 5 (B) Auxiliary battery negative (-) → Terminal 7 (E)	Parking light light illuminates
Auxiliary battery positive (+) → Terminal 2 (B) Auxiliary battery negative (-) → Terminal 7 (E)	Turn signal light illuminates
Auxiliary battery positive (+) → Terminal 6 (B) Auxiliary battery negative (-) → Terminal 7 (E)	Side marker light illuminates

If the result is not as specified, replace the headlight assembly LH.

*a	Component without harness connected (Headlight Assembly LH)

2. INSPECT HEADLIGHT ASSEMBLY RH (w/o Cornering Light)

(a) Apply auxiliary battery voltage to the headlight assembly RH and check that the lights illuminate.

OK:

Measurement Condition	Specified Condition
Auxiliary battery positive (+) → Terminal 4 (LO) Auxiliary battery negative (-) → Terminal 7 (E)	Lo beam headlight illuminates
Auxiliary battery positive (+) → Terminal 3 (HI) Auxiliary battery negative (-) → Terminal 7 (E)	Hi beam headlight illuminates
Auxiliary battery positive (+) → Terminal 1 (B) Auxiliary battery positive (+) → Terminal 4(LO) Auxiliary battery negative (-) → Terminal 7 (E)	Daytime running light illuminates
Auxiliary battery positive (+) → Terminal 5 (B) Auxiliary battery negative (-) → Terminal 7 (E)	Parking light light illuminates
Auxiliary battery positive (+) → Terminal 2 (B) Auxiliary battery negative (-) → Terminal 7 (E)	Turn signal light illuminates
Auxiliary battery positive (+) → Terminal 6 (B) Auxiliary battery negative (-) → Terminal 7 (E)	Side marker light illuminates

If the result is not as specified, replace the headlight assembly RH.

*a	Component without harness connected (Headlight Assembly RH)

Toyota Avalon (XX50) 2019-2022 Service & Repair Manual > Lighting System(for Hv Model Without Cornering Light): LO-beam Headlight does not Illuminate
DESCRIPTION The main body ECU (multiplex network body ECU) controls the low beam headlights. WIRING DIAGRAM CAUTION / NOTICE / HINT NOTICE: Inspect the fuses for circuits related to this system before performing the following procedure. Before replacing the main body ECU (multiplex network body ECU) ...

Toyota Avalon (XX50) 2019-2022 Owners Manual