Lexus IS250 IS220d GSE20 ALE20 2AD-FHV STARTING
CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU - BATTERY AND BODY GROUND)
READ VALUE OF INTELLIGENT TESTER
INSPECT JUNCTION BLOCK (RH-IG RELAY, LH-IG RELAY, ACC RELAY, PWR POINT RELAY)
INSPECT POWER SOURCE CONTROL ECU
CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU AND BODY GROUND - ENGINE SWITCH)
ENTRY AND START SYSTEM - Power Source Mode does not Change to ON (IG and ACC)
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 | |
| 6.INSPECT RELAY (IG2) |
Remove the IG2 relay from the engine room R/B No. 2.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection Specified Condition 3 - 5 10 kΩ or higher 3 - 5 Below 1 Ω
(When battery voltage is applied to terminals 1 and 2)
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| OK | |
| 7.INSPECT JUNCTION BLOCK (RH-IG RELAY, LH-IG RELAY, ACC RELAY, PWR POINT 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 - Body ground Always 10 kΩ or higher RD-2 - RA-5 or RD-7 Always 68 to 250 Ω at 20°C (68°F) RD-2 - Body ground Always 10 kΩ or higher RD-6 - RD-12 Always Below 1 Ω RM-1 - RD-14 When battery voltage is applied to terminals RD-6 and RA-5 or RD-7 Below 1 Ω RM-1 - RD-27 When battery voltage is applied to terminals RD-2 and RA-5 or RD-7 Below 1 Ω RM-1 - RJ-16 When battery voltage is applied to terminals RD-2 and 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 | |
| 8.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 J55-11 (ACCD) - RD-2 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 J55-11 (ACCD) or RD-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 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-13 Always Below 1 Ω LD-8 - 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 Condition Specified Condition LM-1 - Body ground Always 10 to 14 V
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| OK | |
| 9.INSPECT POWER SOURCE CONTROL ECU |
Reconnect the J55 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. J55-11 (ACCD) - Body ground Engine switch off Below 1 V Engine switch on (ACC) Output voltage at terminal AM2 is -2 V or more.
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| OK | ||
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| 10.INSPECT ENGINE SWITCH |
Remove the engine switch.
Measure the resistance of the switch.
- Standard resistance:
Tester Connection Switch Condition Specified Condition 7 (SS1) - 5 (GND) Pushed Below 1 Ω 2 (SS2) - 5 (GND) Pushed Below 1 Ω 7 (SS1) - 5 (GND) Not pushed 10 kΩ or higher 2 (SS2) - 5 (GND) Not pushed 10 kΩ or higher
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| OK | |
| 11.CHECK WIRE HARNESS (POWER SOURCE CONTROL ECU AND BODY GROUND - ENGINE SWITCH) |
Disconnect the J55 ECU connector.
Measure the resistance according to the value(s) in the table below.
- Standard resistance:
Tester Connection (Symbols) Condition Specified Condition J31-7 (SS1) - J55-14 (SSW1) Always Below 1 Ω J31-2 (SS2) - J55-37 (SSW2) Always Below 1 Ω J31-5 (GND) - Body ground Always Below 1 Ω J31-7 (SS1) or J55-14 (SSW1) - Body ground Always 10 kΩ or higher J31-2 (SS2) or J55-37 (SSW2) - Body ground Always 10 kΩ or higher
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| OK | ||
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