Subaru Legacy BN/BS (2015-2019) Service Manual: Diagnostics chart for security indicator light inspection

Subaru Legacy BN/BS (2015-2019) Service Manual / Immobilizer (diagnostics) / Diagnostics chart for security indicator light inspection

1. CHECK SECURITY INDICATOR LIGHT CIRCUIT

CAUTION:

When the body integrated unit (except for C0 and C5 models) or the immobilizer CM (C0 and C5 models) is replaced, registration of the immobilizer system is required. For details, refer to the “REGISTRATION MANUAL FOR IMMOBILIZER” provided as a separate volume.

NOTE:

For the coupling connector, refer to “WIRING SYSTEM”.

WIRING DIAGRAM:

Immobilizer system Immobilizer System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK FUSE. 1) Remove the ignition key from ignition switch. Or, turn off the power. 2) Check the fuse.	Is the fuse OK-	Diagnostics Chart for Security Indicator Light > INSPECTION	Replace the fuse. If the replaced fuse blows out easily, repair the short circuit in the harness between the fuse and body integrated unit.
2.CONFIRM DESTINATION. Verify the destination of the vehicle.	Is destination for C0 or C5-	Diagnostics Chart for Security Indicator Light > INSPECTION	Diagnostics Chart for Security Indicator Light > INSPECTION
3.CHECK IMMOBILIZER CM. Check the current data «Ignition SW input» of immobilizer CM. Read Current Data	Does the display change in accordance with the ignition switch OFF ←> ON-	Diagnostics Chart for Security Indicator Light > INSPECTION	Diagnostics Chart for Security Indicator Light > INSPECTION
4.CHECK IGNITION SWITCH CIRCUIT. 1) Turn the ignition switch to OFF. 2) Remove the F/B fuse No. 3. 3) Measure the voltage between F/B fuse No. 3 (lower stream side) and chassis ground. Connector & terminal F/B fuse No. 3 (lower stream side) (+) — Chassis ground (−):	Is the voltage 6 V or more-	Repair the short circuit to power supply in harness between the immobilizer CM and fuse.	Diagnostics Chart for Security Indicator Light > INSPECTION
5.CHECK IGNITION SWITCH CIRCUIT. Check the current data «Ignition SW input» of immobilizer CM. Read Current Data	Is «ON» displayed-	Replace the immobilizer CM. Immobilizer Control Module	Diagnostics Chart for Security Indicator Light > INSPECTION
6.CHECK IGNITION SWITCH CIRCUIT. 1) Disconnect the connector from immobilizer CM. 2) Measure the resistance between immobilizer CM connector terminal and fuse. Connector & terminal (i34) No. 2 — F/B fuse No. 3 (lower stream side):	Is the resistance less than 10 --	Replace the immobilizer CM. Immobilizer Control Module	Replace the open circuit of harness between the immobilizer CM and fuse.
7.CHECK IMMOBILIZER CM. Check the current data «key-lock warning SW» of immobilizer CM. Read Current Data	Does the display change in accordance with the ignition key removal/insertion-	Diagnostics Chart for Security Indicator Light > INSPECTION	Check the key switch circuit. Diagnostics Chart for Security Indicator Light > INSPECTION
8.CHECK IMMOBILIZER CM. 1) Check the current data «Immobilizer indicator output» of immobilizer CM. Read Current Data 2) Remove the ignition key from ignition switch. 3) Wait at least 60 seconds.	Is «Blink» displayed-	Diagnostics Chart for Security Indicator Light > INSPECTION	Replace the immobilizer CM. Immobilizer Control Module
9.CHECK SECURITY INDICATOR LIGHT. 1) Disconnect the connector from body integrated unit. 2) Connect the resistor (100 -) between the body integrated unit connector terminal (i171) No. 26 and chassis ground.	Does the security indicator light illuminate-	Diagnostics Chart for Security Indicator Light > INSPECTION	Diagnostics Chart for Security Indicator Light > INSPECTION
10.CHECK BODY INTEGRATED UNIT GROUND CIRCUIT. Measure the resistance between the body integrated unit connector terminal and chassis ground. Connector & terminal (B280) No. 2 — Chassis ground: (i84) No. 4 — Chassis ground:	Is the resistance less than 10 --	Diagnostics Chart for Security Indicator Light > INSPECTION	Repair the open circuit of the body integrated unit ground circuit.
11.CHECK BODY INTEGRATED UNIT POWER SUPPLY CIRCUIT. Measure the voltage between the body integrated unit connector terminal and chassis ground. Connector & terminal (B280) No. 4 (+) — Chassis ground (−): (B280) No. 7 (+) — Chassis ground (−): (B281) No. 32 (+) — Chassis ground (−):	Is the voltage 10 V or more-	Replace the body integrated unit. Body Integrated Unit	Check the harness for open or short circuit between body integrated unit and fuse.
12.CHECK COMBINATION METER CIRCUIT. 1) Remove the combination meter. Combination Meter 2) Measure the voltage between combination meter connector terminal and chassis ground. Connector & terminal (i10) No. 1 (+) — Chassis ground (−):	Is the voltage 1 V or more-	Diagnostics Chart for Security Indicator Light > INSPECTION	Check for an open or short circuit in the harness between the combination meter and fuse.
13.CHECK COMBINATION METER CIRCUIT. Measure the resistance between the body integrated unit connector terminal and combination meter connector terminal. Connector & terminal (i171) No. 26 — (i10) No. 19:	Is the resistance less than 10 --	LED bulb is defective. Replace the combination meter case assembly. Combination Meter > DISASSEMBLY	Repair the harness or connector.

2. CHECK KEY SWITCH CIRCUIT

CAUTION:

WIRING DIAGRAM:

Immobilizer system Immobilizer System > WIRING DIAGRAM

STEP	CHECK	YES	NO
1.CHECK POWER SUPPLY CIRCUIT. 1) Disconnect the connector from key warning switch. 2) Measure the voltage between key warning switch connector terminal and chassis ground. Connector & terminal (i63) No. 1 (+) — Chassis ground (−):	Is the voltage 10 V or more-	Diagnostics Chart for Security Indicator Light > INSPECTION	Check the harness for an open or short between the key warning switch and fuse.
2.CHECK KEY WARNING SWITCH. 1) Insert the ignition key in the ignition switch. (OFF or ACC) 2) Measure the resistance between key warning switch connector terminals. Connector & terminal No. 1 — No. 2:	Is the resistance less than 1 --	Diagnostics Chart for Security Indicator Light > INSPECTION	Replace the key warning switch. Key Lock Cylinders
3.CHECK KEY WARNING SWITCH. 1) Remove the ignition key from ignition switch. 2) Measure the resistance between key warning switch connector terminals. Connector & terminal No. 1 — No. 2:	Is the resistance 1 M- or more-	Diagnostics Chart for Security Indicator Light > INSPECTION	Replace the key warning switch. Key Lock Cylinders
4.CHECK HARNESS BETWEEN KEY WARNING SWITCH AND BODY INTEGRATED UNIT (EXCEPT FOR C0 AND C5 MODELS) OR IMMOBILIZER CM (C0 AND C5 MODELS). 1) Disconnect the connector from the body integrated unit (except for C0 and C5 models) or the immobilizer CM (C0 and C5 models). 2) Measure the resistance between key warning switch connector terminal and body integrated unit (except for C0 and C5 models) or immobilizer CM (C0 and C5 models) connector terminal. Connector & terminal Body integrated unit (except for C0 and C5 models) (i63) No. 2 — (i84) No. 10: Immobilizer CM (C0 and C5 models) (i63) No. 2 — (i34) No. 3:	Is the resistance less than 10 --	Replace the body integrated unit (except for C0 and C5 models) Body Integrated Unit or immobilizer CM (C0 and C5 models) Immobilizer Control Module.	Repair harness between key warning switch and body integrated unit (except for C0 and C5 models) or immobilizer CM (C0 and C5 models).

Clear memory mode operation

NOTE:For detailed operation procedures, refer to “Application help”.1. ECM1. On «Start» display, select «Diagnosis».2. On «Vehicle selection» display, input the target vehicle inform ...

Electrical component location location

(1)Security indicator light(3)Immobilizer antenna(5)Ignition key(2)Body integrated unit(4)Combination meter(6)Immobilizer control module (C0 and C5 models) ...

Other materials:

Installation
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