Power Source Mode does not Change to ON (IG)
THEFT DETERRENT / KEYLESS ENTRY: SMART KEY SYSTEM (for Start Function): Power Source Mode does not Change to ON (IG)
- Power Source Mode does not Change to ON (IG)
DESCRIPTION
When the engine switch is pushed with the electrical key transmitter in the cabin, the power source control ECU receives signals to switch the power source mode.
Use this troubleshooting procedure when the power source mode does not change to on (IG) but does change to on (ACC).
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
Refer to "Power Source Mode does not Change to on (IG and ACC)" Power Source Mode does not Change to ON (IG and ACC).
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) Power Source Mode does not Change to ON (IG and ACC)
NG -- GO TO DTC CHART
OK -- Continue to next step.
2. CHECK HARNESS AND CONNECTOR (BATTERY - POWER SOURCE CONTROL ECU)
(a) Disconnect the C43 power source control ECU connector.
(b) Measure the voltage according to the value(s) in the table below.
Standard Voltage:
Text in Illustration
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR IN CIRCUIT CONNECTED TO POWER SOURCE
OK -- Continue to next step.
3. INSPECT INTEGRATION RELAY (IG2 RELAY)
(a) Remove the integration relay.
(b) Inspect the integration relay Testing and Inspection.
NG -- REPLACE INTEGRATION RELAY
OK -- Continue to next step.
4. INSPECT INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY (IG1 NO. 1, IG1 NO. 2 AND IG1 NO. 3 RELAYS)
(a) Disconnect the 2C and 2D instrument panel junction block assembly connectors.
Text in Illustration
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPLACE INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY
OK -- Continue to next step.
5. CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY)
(a) Disconnect the C43 power source control ECU connector.
(b) Disconnect the 2C instrument panel junction block assembly connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
6. CHECK HARNESS AND CONNECTOR (INSTRUMENT PANEL JUNCTION BLOCK ASSEMBLY - BODY GROUND)
(a) Disconnect the 2D instrument panel junction block assembly connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
7. CHECK HARNESS AND CONNECTOR (POWER SOURCE CONTROL ECU - INTEGRATION RELAY)
(a) Disconnect the C42 power source control ECU connector.
(b) Disconnect the 1A integration relay connector.
(c) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
8. CHECK HARNESS AND CONNECTOR (INTEGRATION RELAY - BODY GROUND)
(a) Disconnect the 1A integration relay connector.
(b) Measure the resistance according to the value(s) in the table below.
Standard Resistance:
NG -- REPAIR OR REPLACE HARNESS OR CONNECTOR
OK -- Continue to next step.
9. CHECK POWER SOURCE CONTROL ECU B2271
NG -- REPLACE POWER SOURCE CONTROL ECU Removal
OK -- USE SIMULATION METHOD TO CHECK How To Proceed With Troubleshooting