Infiniti Q45 (FY33). Manual - part 99

SBR684D

Diagnostic Procedure 24 (TCS OFF indicator
does not come on when ignition switch is
turned on.)

SBR392E

WARNING LAMP CIRCUIT CHECK

----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------

Check 7.5A fuse

for warning lamp. For

fuse layout, refer to POWER SUPPLY
ROUTING in EL section.

Replace fuse.

Replace bulb.

1. Install 7.5A fuse.
2. Disconnect connector from ABS/TCS

control unit.

3. Check voltage between ABS/TCS con-

trol unit connector terminal

and

ground after turning ignition switch
“ON”.
Battery voltage should exist after
turning ignition switch “ON”.

Check warning lamp bulb.

Repair harness and con-
nectors between fuse box
and ABS/TCS control unit
connector terminal

(including combination
meter).

1. Disconnect connectors from ABS/TCS

control unit. Check terminals for dam-
age or loose connection. Then recon-
nect connectors.

2. Carry out self-diagnosis again.

Does warning lamp activate again?

Yes

Inspection end

Check items the self-diagnosis detected
as faulty.

IDX

TROUBLE DIAGNOSES FOR SYMPTOMS

BR-113

SBR393E

Diagnostic Procedure 25 (ABS warning lamp
does not come on when ignition switch is
turned on.)

SBR394E

SBR395E

SBR396E

WARNING LAMP CIRCUIT CHECK

Check 7.5A fuse

for warning lamp. For

fuse layout, refer to POWER SUPPLY
ROUTING in EL section.

Replace fuse.

Replace bulb.

1. Install 7.5A fuse.
2. Disconnect connectors from ABS/TCS

control unit and actuator.

3. Check voltage between ABS/TCS con-

trol unit connector terminal

and

ground after turning ignition switch
“ON”.
Battery voltage should exist after
turning ignition switch “ON”.

Check warning lamp bulb.

Repair harness and con-
nectors between fuse box
and ABS/TCS control unit
connector terminal

(including combination
meter).

1. Turn ignition switch “OFF”.

Disconnect ABS actuator 8-pin connec-
tor.

2. Check continuity between ABS/TCS

control unit connector terminal

and

ABS actuator 8-pin connector (body
side) terminal

Continuity should exist.

Repair harness and con-
nectors between ABS
warning lamp (combination
meter) and ABS actuator
8-pin connector (body side)
terminal

1. Disconnect ABS actuator 8-pin connec-

tor.

2. Check continuity between ABS actuator

harness 8-pin connector (body side)
terminal

and body ground.

Continuity should exist.

Repair harness and con-
nectors.

(Go to next page.)

TROUBLE DIAGNOSES FOR SYMPTOMS

BR-114

SBR397E

SBR376E

1. Disconnect ABS actuator 8-pin connec-

tor.

2. Check continuity between ABS actuator

8-pin connector (ABS actuator side)
terminals

and

Continuity should exist.

Note: Pay attention to tester polarity*.

Replace ABS actuator.

CONTROL UNIT POWER SUPPLY CIR-
CUIT.

Go to

in Diagnostic Procedure 26,

BR-116.

Repair harness and con-
nectors.

CHECK SOLENOID VALVE RELAY.

Replace ABS relay unit.

Go to Diagnostic Procedure 11, BR-96.

*: Specifications may vary depending on the type of tester.

Before performing this inspection, refer to the instruction manual of
the tester.

Relay type

Solenoid valve

relay

Condition

Continuity exist-

ence between

terminals

and

Battery voltage
not applied
between each
terminal

and

Yes

Battery voltage
applied
between each
terminal

and

Check resis-
tance between
each terminal

and

Approx. 100

Ω

IDX

TROUBLE DIAGNOSES FOR SYMPTOMS

Diagnostic Procedure 25 (ABS warning lamp
does not come on when ignition switch is
turned on.) (Cont’d)

BR-115

SBR371E

Diagnostic Procedure 26 (ABS warning lamp
stays on when ignition switch is turned on.)

SBR398E

SBR399E

SBR400E

CONTROL UNIT POWER SUPPLY
CIRCUIT

Check 7.5A fuse

for control unit.

For fuse layout, refer to POWER SUPPLY
ROUTING in EL section.

(Skip page.)

1. Disconnect connector from ABS/TCS

control unit.

2. Check voltage between ABS/TCS con-

trol unit connector terminal

108

and

ground after turning ignition switch
“ON”.
Battery voltage should exist.

Check the following.

Harness connector

B103

Harness for open or
short between control
unit and fuse

If NG, repair harness or
connectors.

SOLENOID VALVE RELAY COIL
POWER SUPPLY CIRCUIT

1. Turn ignition switch “OFF”. Disconnect

ABS actuator 8-pin connector.

2. Check continuity between ABS/TCS

control unit connector terminals and
ABS actuator 8-pin connector (body
side) terminals.

Continuity should exist.

Check the following.

Harness connectors

B103

Harness for open or short
between actuator terminal
(body side) and ABS/TCS
control unit

If NG, repair harness or
connectors.

CIRCUIT CHECK

1. Disconnect ABS actuator 8-pin connec-

tor.

2. Check continuity between ABS actuator

8-pin connector (ABS actuator side)
terminals

and

Continuity should exist.

Replace ABS actuator.

SOLENOID VALVE RELAY CHECK

Go to

in Diagnostic Procedure 25,

BR-115.

Replace ABS actuator.

(Go to next page.)

ABS/TCS control unit

ABS actuator

108

TROUBLE DIAGNOSES FOR SYMPTOMS

BR-116

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