Lexus IS250 IS220d GSE20 ALE20 4GR-FSE STARTING
CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)
INSPECT JUNCTION BLOCK (RH-IG RELAY, LH-IG RELAY)
INSPECT POWER SOURCE CONTROL ECU
REPLACE FAULTY RELAY OR J/B AND CHECK POWER SOURCE CONTROL ECU
REPLACE FAULTY WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU
ENTRY AND START SYSTEM - Power Source Mode does not Change to ON (IG)
DESCRIPTION
When the engine switch is pushed with the electrical key in the cabin, the power source control ECU receives signals to switch the power source mode.
- HINT:
- To allow use of the intelligent tester to inspect the entry and start system when the engine switch is off, repeat opening and closing any of the doors. Opening and closing a door establishes communication between the intelligent tester and the power source control ECU. (Opening and closing a door can also be simulated by operating a door courtesy light switch.)
WIRING DIAGRAM
INSPECTION PROCEDURE
| 1.INSPECT FUSE (AM2) |
Remove the AM2 fuse from the cowl side J/B RH.
Measure the resistance of the fuse.
- Standard resistance:
- Below 1 Ω
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| OK | |
| 5.INSPECT JUNCTION BLOCK (RH-IG RELAY, LH-IG RELAY) |
RH-IG relay:
Disconnect the cowl side J/B RH connectors.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Condition Specified Condition RD-6 - RA-5 or RD-7 Always 136 to 250 Ω at 20°C (68°F) RD-6 - RD-12 Always Below 1 Ω RD-6 - Body ground Always 10 kΩ or higher RM-1 - RD-14 When battery voltage is applied to terminals RD-6 and RD-12 or RA-5 or RD-7) Below 1 Ω
LH-IG relay:
Disconnect the cowl side J/B LH connectors.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Condition Specified Condition LD-13 - LD-8 or LD-9 Always 68 to 250 Ω at 20°C (68°F) LD-13 - Body ground Always 10 kΩ or higher LM-1 - LK-6 When battery voltage is applied to terminals LD-13 and LD-8 or LD-9) Below 1 Ω LM-1 - LD-29 When battery voltage is applied to terminals LD-13 and LD-8 or LD-9) Below 1 Ω
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| OK | |
| 6.CHECK WIRE HARNESS |
Inspect the resistance and voltage (Power source control ECU or battery - IG2 relay).
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection (Symbols) Condition Specified Condition J55-35 (IG2D) - IG2 relay terminal 2 Always Below 1 Ω IG2 relay terminal 1 - Body ground Always Below 1 Ω J55-35 (IG2D) or IG2 relay terminal 2 - Body ground Always 10 kΩ or higher
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
Tester Connection Condition Specified Condition IG2 relay terminal 5 - Body ground Always 10 to 14 V
Inspect the resistance and voltage (Power source control ECU or battery - Cowl side J/B RH).
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection (Symbols) Condition Specified Condition J55-34 (IG1D) - RD-6 Always Below 1 Ω RD-7 - Body ground Always Below 1 Ω RA-5 - Body ground Always Below 1 Ω J55-34 (IG1D) or RD-6 - Body ground Always 10 kΩ or higher
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
Tester Connection (Symbols) Condition Specified Condition RM-1 - Body ground Always 10 to 14 V
Inspect the resistance (Cowl side J/B RH - Cowl side J/B LH).
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection (Symbols) Condition Specified Condition RD-12 - LD-3 Always Below 1 Ω RD-12 - Body ground Always 10 kΩ or higher LD-18 - Body ground Always Below 1 Ω LD-9 - Body ground Always Below 1 Ω
Inspect the voltage (Battery - Cowl side J/B LH).
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
Tester Connection (Symbols) Condition Specified Condition LM-1 - Body ground Always 10 to 14V
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| OK | |
| 7.INSPECT POWER SOURCE CONTROL ECU |
Reconnect the connectors.
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
Tester Connection (Symbols) Condition Specified Condition J55-34 (IG1D) - Body ground Engine switch off Below 1 V Engine switch on (IG) Output voltage at terminal AM2 is -2 V or more. J55-35 (IG2D) - Body ground Engine switch off Below 1 V Engine switch on (IG) Output voltage at terminal AM2 is -2 V or more.
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| OK | ||
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| 8.REPLACE FAULTY RELAY OR J/B AND CHECK POWER SOURCE CONTROL ECU |
Replace a faulty relay or J/B and then connect the power source control ECU connector.
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
Tester Connection (Symbols) Condition Specified Condition J55-34 (IG1D) - Body ground Engine switch off Below 1 V Engine switch on (IG) Output voltage at terminal AM2 is -2 V or more. J55-35 (IG2D) - Body ground Engine switch off Below 1 V Engine switch on (IG) Output voltage at terminal AM2 is -2 V or more.
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| OK | ||
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| 9.REPLACE FAULTY WIRE HARNESS OR CONNECTOR AND CHECK POWER SOURCE CONTROL ECU |
Repair or replace a faulty wire harness or connector and then connect the power source control ECU connector.
Measure the voltage according to the value(s) in the table below.
- Standard voltage:
Tester Connection (Symbols) Condition Specified Condition J55-34 (IG1D) - Body ground Engine switch off Below 1 V Engine switch on (IG) Output voltage at terminal AM2 is -2 V or more. J55-35 (IG2D) - Body ground Engine switch off Below 1 V
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| OK | ||
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