T-TT-0609-20

Tech Tip T-TT-0609-20
May 13, 2020
Subject
Market
USA
Headlamp DRL Function Issue Identification
Service Category
Section
Vehicle Exterior
Lighting (ext)
Applicability
2019-2020 Avalon
APPLICABLE VEHICLES
2019-2020
Avalon
CONDITION
Some 2019 & 2020 model year Avalon & Avalon HV may exhibit abnormal, partial or 100%
inoperative function of either the passenger side, driver side, or both LED1 Headlamp Day Time
Running Lights (DRL). This may be caused by an internal fault in the headlamp assembly or DRL
logic issue.
Figure 1. DRL partial function condition shown.
1Light
emitting diode daytime running lamp.
RECOMMENDATIONS
1. In the event the Headlamp LED-DRL is exhibiting abnormal, partial or 100% no function of
either passenger side, driver side or both LED-DRLs use the flowchart on the next page titled
“19-20MY Avalon Headlamp DRL Function Issue Identification Flow” to judge between
headlamp assembly internal fault or LED-DRL logic issues.
2. In the case where headlamp assembly internal fault is identified per DRL Function Issue
Identification Flow Chart in page 3, or if is not an internal fault, then:
 Continue diagnosis using the applicable Repair Manual.
3. In the case where logic issue is identified:
 Submit a Dealer Product Report on TIS including pictures and details of the condition.
 Inform the customer that this issue is currently under investigation and that the issue only
affects the headlamp DRL function when the vehicle is in reverse and the headlamps are
turn on. Recommend turning on their headlamps when their shifter is in the Park or Drive
positions.
Expires on
Ver. 2.12 01/01/2020 T
05/13/2021
© 2020, Toyota Motor Sales, USA
Page 1 of 2
Tech Tip T-TT-0609-20
May 13, 2020
Subject
Market
Headlamp DRL Function Issue Identification
USA
Applicability
RECOMMENDATIONS
19-20MY Avalon Headlamp DRL Function Issue Identification Flow:
LED-DRL Abnormal/No Function
Headlamp Internal Fault
LED-DRL Function Logic
LED-DRL abnormal, partial/full no
function
issue identified.
Confirm LED-DRL logic function.
LED-DRL Logic Function
Confirmation Process (do 3 times)2:
Condition affects 100% of
DRL-LED on either
each or passenger or driver sides.
Does condition affect 100% of the
DRL-LED strip or only partially
(per side or both sides)?
See fig. 1. for example.
Step 1: Park Vehicle indoors.
Step 2: Turn engine Off.
Step 3: Turn Ignition key to the On
position.
Step 4: Place vehicle shifter in the
Reverse position.
Step 5: Turn Headlamp Switch to
Auto position.
Step 6: Confirm LED-DRL function.
Step 7: Return vehicle shifter in the
Park position.
Step 8: Turn engine On.
Step 9: Go back to step 2 and
repeat cycle until a minimum of 3
cycles have been completed.
Did 100% LED-DRL function
return on any cycle for both
passenger or driver sides?
No
Partial abnormal / partial No function
(per side or both sides)
Yes
Headlamp assembly internal
fault issue identified.
Caution:
Confirm that parking brake is engaged and engine is off when
conducting diagnostics study unless specified to turn engine on.
Logic issue identified.
2
Note: Logic issue may not occur on
the 1st try.
LINK REFERENCES
This Tech Tip does not contain any link references
Expires on
Ver. 2.12 01/01/2020 T
05/13/2021
© 2020, Toyota Motor Sales, USA
Page 2 of 2