Power Source Mode does not Change to ON (IG and ACC)
THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function): Power Source Mode does not Change to ON (IG and ACC)
- Power Source Mode does not Change to ON (IG and ACC)
DESCRIPTION
When the electrical key transmitter is in the vehicle and the engine switch is pressed, the power source control ECU receives a signal and changes the power source mode.
HINT
* When the power source control ECU is replaced with a new one and the cable is connected to the negative (-) battery terminal, the power source mode changes to on (IG).
* When the battery cable is disconnected and reconnected, the power source mode returns to the mode it was in before the battery cable was disconnected.
WIRING DIAGRAM
INSPECTION PROCEDURE
NOTICE:
* When using the Techstream with the engine switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins, or 2) connect the Techstream to the vehicle, select the vehicle type under manual mode, and then enter the following menus: Body Electrical / Smart Key / Trouble Codes.
* Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart Smart Key System (for Start Function).
* The smart key system uses multiplex communication. First perform the inspections in "How to Proceed with Troubleshooting" to confirm that there are no communication malfunctions before proceeding with troubleshooting How to Proceed With Troubleshooting.
* If the smart key system is disabled through the customize function, enable the system before performing troubleshooting Smart Key System (for Start Function).
* Inspect the fuses of circuits related to this system before performing the following inspection procedure.
* After completing repairs, confirm that the problem does not reoccur.
HINT
Related Data List and Active Test Items
PROCEDURE
1. CHECK DTC (ALL)
(a) Using the Techstream, confirm the output of DTCs for all systems.
OK:
No DTCs are output.
NOTICE:
* When using the Techstream with the engine switch off, perform either of the following: 1) Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins, or 2) connect the Techstream to the vehicle, select the vehicle type under manual mode, and then enter the following menus: Body Electrical / Smart Key / Trouble Codes.
* Make sure that no DTCs are output. If any DTCs are output, proceed to the Diagnostic Trouble Code Chart.
NG -- GO TO DTC CHART
OK -- Continue to next step.
2. CHECK WIRELESS DOOR LOCK CONTROL SYSTEM
(a) Check that the wireless lock and unlock functions operate normally.
OK:
Wireless lock and unlock functions operate normally.
HINT
If the wireless lock and unlock functions operate normally, it can be determined that some functions of the electrical key transmitter and certification ECU (smart key ECU assembly) operate normally.
NG -- GO TO SMART KEY SYSTEM (for Entry Function) (PROBLEM SYMPTOMS TABLE) Problem Symptoms Table
OK -- Continue to next step.
3. INSPECT SMART KEY SYSTEM
(a) Remove the battery of the electrical key transmitter.
(b) With the brake pedal (for Automatic Transaxle) or clutch pedal (for Manual Transaxle) depressed, touch the electrical key transmitter to the engine switch.
(c) Press and hold the engine switch for a maximum of 15 seconds and check if the engine can be started.
OK:
The engine can be started.
HINT
* If the engine can be started, it is clear that the electrical key transmitter is not being detected properly inside the vehicle. There may be a problem with the formation of the interior detection area, a problem with the indoor electrical key antenna (reception problem), or wave interference.
* If the engine cannot be started, there is a problem with the engine switch, power source control ECU or a related wire harness.
NG -- READ VALUE USING TECHSTREAM (START SWITCH 1, 2)
OK -- GO TO SMART KEY SYSTEM (for Entry Function) (ROOM OSCILLATOR DOES NOT RECOGNIZE KEY) Testing and Inspection
4. READ VALUE USING TECHSTREAM (START SWITCH 1, 2)
(a) Connect the Techstream to the DLC3.
(b) Turn the Techstream on.
NOTICE:
When using the Techstream with the engine switch off, perform either of the following: Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins, or connect the Techstream to the vehicle and select the vehicle type under manual mode.
(c) Enter the following menus: Body Electrical / Power Source Control / Data List.
(d) According to the display on the Techstream, read the Data List.
Power Source Control
OK:
The display changes in response to the operation of the engine switch.
NG -- INSPECT ENGINE SWITCH
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (BATTERY - POWER SOURCE CONTROL ECU) B2271
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - BODY GROUND) B2271
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. CHECK POWER SOURCE CONTROL ECU
(a) Connect the power source control ECU connectors.
(b) Connect the Techstream to the DLC3.
(c) Turn the Techstream on.
NOTICE:
When using the Techstream with the engine switch off, perform either of the following: Turn a courtesy light switch on and off at intervals of 1.5 seconds or less until communication between the Techstream and vehicle begins, or connect the Techstream to the vehicle and select the vehicle type under manual mode.
(d) Enter the following menus: Body Electrical / Power Source Control / Data List.
(e) Read the Data List and check that the display changes according to the changes in the power source mode when the engine switch is pushed.
Power Source Control
OK:
Display changes according to the changes in the power source mode when the engine switch is pushed.
(f) Measure the voltage according to the value(s) in the table below.
Text in Illustration
Standard Voltage:
HINT
*1: To turn the engine switch on (ACC), carry the electrical key transmitter and press the engine switch with the shift lever in P (for Automatic Transaxle) and the brake pedal (for Automatic Transaxle) or clutch pedal (for Manual Transaxle) released.
*2: To turn the engine switch on (IG), carry the electrical key transmitter and press the engine switch twice with the shift lever in P (for Automatic Transaxle) and the brake pedal (for Automatic Transaxle) or clutch pedal (for Manual Transaxle) released.
NG -- REPLACE POWER SOURCE CONTROL ECU Removal
OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting
8. INSPECT ENGINE SWITCH
(a) Remove the engine switch.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
Text in Illustration
NG -- REPLACE ENGINE SWITCH Removal
OK -- Continue to next step.
9. CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - ENGINE SWITCH)
(a) Disconnect the C43 power source control ECU connector.
(b) Disconnect the C15 engine switch connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- REPLACE POWER SOURCE CONTROL ECU Removal