Power Switch Illumination Circuit [08/2013 - ]: Procedure

WARNING: This page is about a different car, the 2014 Lexus ES 300h. However, it is still accessible from the selected car via links, so may be relevant.

PERFORM ACTIVE TEST USING TECHSTREAM

Connect the Techstream to the DLC3.
Turn the power switch on (IG).
Turn the Techstream on.
Enter the following menus: Body Electrical / Smart Access / Active Test.

Check that the illumination operates.

SMART ACCESS

Tester Display	Test Part	Control Range	Diagnostic Note
Power/Engine SW Light	Power switch light	OFF/ON	When performing this Active Test, make sure the following condition is met: The power switch illumination is off (15 seconds or more have elapsed since it turned from on to off) and the power switch is on (ACC) or on (IG), or the hybrid control system is running.

Power switch illumination comes on.

NG → See step 2

OK → See step 5

INSPECT POWER SWITCH
1. Remove the power switch. Refer to REMOVAL [08/2013 - ] .
2. Inspect the power switch. Refer to INSPECTION [08/2013 - ] .
  OK
  
  Power switch illumination comes on.
NG → See step 4

OK: Go to next step

CHECK HARNESS AND CONNECTOR (POWER SWITCH - CERTIFICATION ECU (SMART KEY ECU ASSEMBLY))

Disconnect the H57 and H58 certification ECU (smart key ECU assembly) connector.
Disconnect the H44 power switch connector.

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

Standard Resistance

Tester Connection	Condition	Specified Condition
H44-9 (SWIL) - H58-6 (SWIL)	Always	Below 1 Ω
H44-6 (AGND) - H57-6 (AGND)	Always	Below 1 Ω
H44-9 (SWIL) - Body ground	Always	10 kΩ or higher
H44-6 (AGND) - Body ground	Always	10 kΩ or higher

NG → REPAIR OR REPLACE HARNESS OR CONNECTOR

OK → See step 6

REPLACE POWER SWITCH. Refer to REMOVAL [08/2013 - ]
PROCEED TO NEXT SUSPECTED AREA SHOWN IN PROBLEM SYMPTOMS TABLE. Refer to PROBLEM SYMPTOMS TABLE [08/2013 - ]
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY). Refer to REMOVAL [08/2013 - ]