Infiniti F50. Manual - part 233

VEHICLE SECURITY (THEFT WARNING) SYSTEM

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4–2 CHECK DOOR KEY CYLINDER UNLOCK SWITCH

1. 

CHECK DOOR KEY CYLINDER SWITCH INPUT SIGNAL (UNLOCK SIGNAL)

 With CONSULT-II

Check front door key cylinder switch (driver side) “KEY CYL UN-DR” in “DATA MONITOR” mode with CON-
SULT-II.

 Without CONSULT-II

Check voltage between driver door control unit (LCU01) connector
and ground.

OK or NG

OK

>> Front door key cylinder switch (driver side) (unlock) is

OK.

NG

>> GO TO 2.

“KEY CYL UN-DR” should be “ON” when key inserted 
in driver door key cylinder was turned to unlock.

PIIA0353E

Connector

Terminal (wire color)

Key position

Voltage (V)

( + )

( – )

D8

9(PU/W)

Ground

Neutral/Lock

Approx.5

Unlock

0

PIIA2854E

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VEHICLE SECURITY (THEFT WARNING) SYSTEM

2. 

CHECK DOOR KEY CYLINDER SWITCH

1.

Turn ignition switch “OFF”.

2.

Disconnect front door key cylinder switch (driver side) connector.

3.

Check continuity between front door key cylinder switch (driver
side) terminals.

OK or NG

OK

>> Check the following.

●

Front door key cylinder switch (driver side) ground cir-
cuit

●

Harness for open or short between driver door control
unit (LCU01) and front door key cylinder switch (driver side)

NG

>> Replace front door key cylinder switch (driver side).

Diagnostic Procedure 5

EIS003QF

CHECK TRUNK LID KEY UNLOCK SIGNAL

1. 

CHECK TRUNK KEY CYLINDER SWITCH INPUT SIGNAL (UNLOCK SIGNAL)

 With CONSULT-II

Check trunk lid key cylinder switch “TRUNK UNLK SW” in “DATA MONITOR” mode with CONSULT

−

II.

●

When key in key cylinder is at “NEUTRAL” position,

●

When key is “UNLOCK” position,

 Without CONSULT-II

Check trunk lid key cylinder switch in Switch monitor mode.
Refer to Remote keyless entry system 

BL-80, "SWITCH MONITOR"

.

OK or NG

OK

>> Trunk lid key cylinder switch is OK.

NG

>> GO TO 2.

2. 

CHECK TRUNK KEY CYLINDER SWITCH (UNLOCK SWITCH)

1.

Turn ignition switch “OFF”.

2.

Disconnect trunk lid key cylinder switch connector.

3.

Check continuity between trunk lid key cylinder switch terminals.

OK or NG

OK

>> Check the following.

●

Trunk lid key cylinder switch ground circuit

●

Harness for open or short between trunk lid key cylin-
der switch and BCM

NG

>> Replace trunk lid key cylinder switch.

Terminal

Condition

Continuity

1 

−

 2

Neutral/Lock

No

Unlock

Yes

PIIB0204E

TRUNK UNLK SW: OFF

TRUNK UNLK SW: ON

PIIA0356E

Terminals

Condition

Continuity

1 - 2

Neutral

No

Unlocked

Yes

PIIB0202E

VEHICLE SECURITY (THEFT WARNING) SYSTEM

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Diagnostic Procedure 6

EIS003QG

CHECK THEFT WARNING HORN ALARM

1. 

CHECK VEHICLE SECURITY HORN ALARM OPERATION

 With CONSULT-II

●

Check horn relay “ALARM RELAY” in “ACTIVE TEST” mode with CONSULT-II.

●

Perform operation shown on display.

 Without CONSULT-II

1.

Turn ignition switch “OFF”.

2.

Disconnect BCM connector.

3.

Apply ground to BCM connector E204 terminal 127 (G/W). 

OK or NG

OK

>> Horn alarm is OK.

NG

>> GO TO 2.

2. 

CHECK SECURITY HORN RELAY

Check horn relay condition.
OK or NG

OK

>> GO TO 3.

NG

>> Replace horn relay.

Theft warning horn alarm should operate.

PIIA0358E

Does horn alarm activate?

PIIA0359E

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VEHICLE SECURITY (THEFT WARNING) SYSTEM

3. 

CHECK POWER SUPPLY FOR HORN RELAY

1.

Disconnect horn relay connector.

2.

Check voltage between horn relay connector E3-5 terminal 2 and ground.

OK or NG

OK

>> GO TO 4.

NG

>> Check the following.

●

15A fuse [No. 56, located in the fuse, fusible link and
relay block (J/B)]

●

Harness for open or short between horn relay and
fuse

4. 

CHECK HORN RELAY CIRCUIT

1.

Disconnect BCM connector.

2.

Check continuity between BCM connector E204 terminal 127 (G/W) and horn relay connector E3-5 termi-
nals 1 (G/W).

OK or NG

OK

>> GO TO 5.

NG

>> Repair or replace harness.

5. 

CHECK HORN RELAY CIRCUIT

1.

Disconnect horn relay and security horn connector.

2.

Check continuity between horn relay connector E3-5 terminal 3 and horn connector E43,E63 terminal 1
(G,G/OR).

OK or NG?

OK

>> Replace horn.

NG

>> Repair or replace harness.

Battery voltage should exist.

PIIA3248E

Continuity should exist

PIIA3246E

3 - 1 (G)

:Continuity should exist.

3 - 1 (G/OR)

:Continuity should exist.

PIIA3247E