DESCRIPTION
If the engine switch is pressed with the electrical key transmitter sub-assembly in the cabin, the certification ECU (smart key ECU assembly) receives a signal and changes the power source mode.
Related Data List and Active Test Items
Problem Symptom |
Data List and Active Test |
---|---|
Power source mode does not change to on (ACC) but does change to on (IG) |
Power Source Control
Starting Control
|
WIRING DIAGRAM
Click here
CAUTION / NOTICE / HINT
NOTICE:
Click here
Click here
Click here
HINT:
When the cable is disconnected and reconnected to the negative (-) battery terminal, the power source mode returns to the state it was in before the cable was disconnected.
PROCEDURE
1. |
CHECK FOR DTC |
(a) Using the Techstream, check for certification ECU (smart key ECU assembly) DTCs.
Body Electrical > Power Source Control > Trouble Codes Body Electrical > Smart Key > Trouble Codes Body Electrical > Starting Control > Trouble Codes
Result |
Proceed to |
---|---|
DTCs are not output |
A |
Smart key system (for Start Function) DTCs are output |
B |
B | ![]() |
GO TO DIAGNOSTIC TROUBLE CODE CHART |
|
2. |
CHECK HARNESS AND CONNECTOR (CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY) |
Click here
NG | ![]() |
REPAIR OR REPLACE HARNESS OR CONNECTOR |
|
3. |
INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (ACC RELAY) |
Click here
NG | ![]() |
REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
|
|
4. |
CHECK CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
Click here
OK | ![]() |
USE SIMULATION METHOD TO CHECK |
NG | ![]() |
REPLACE CERTIFICATION ECU (SMART KEY ECU ASSEMBLY) |
Toyota CH-R Service Manual > Lumbar Switch: Removal
REMOVAL
CAUTION / NOTICE / HINT
The necessary procedures (adjustment, calibration, initialization, or registration)
that must be performed after parts are removed, installed, or replaced during the
front lumbar power seat switch removal/installation are shown below.
Necessary Procedure After ...
Toyota CH-R Service Manual > Steering Lock System: Problem Symptoms Table
PROBLEM SYMPTOMS TABLE
HINT:
Use the table below to help determine the cause of problem symptoms.
If multiple suspected areas are listed, the potential causes of the symptoms
are listed in order of probability in the "Suspected Area" column of the
table. Check each sy ...