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
4
for warning lamp. For
fuse layout, refer to POWER SUPPLY
ROUTING in EL section.
OK
E
NG
Replace fuse.
Replace bulb.
G
NG
1. Install 7.5A fuse.
2. Disconnect connector from ABS/TCS
control unit.
3. Check voltage between ABS/TCS con-
trol unit connector terminal
q
11
and
ground after turning ignition switch
“ON”.
Battery voltage should exist after
turning ignition switch “ON”.
OK
E
NG
Check warning lamp bulb.
OK
Repair harness and con-
nectors between fuse box
and ABS/TCS control unit
connector terminal
q
11
(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
E
No
Inspection end
Check items the self-diagnosis detected
as faulty.
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
H
H
H
H
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
4
for warning lamp. For
fuse layout, refer to POWER SUPPLY
ROUTING in EL section.
OK
E
NG
Replace fuse.
Replace bulb.
G
NG
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
q
22
and
ground after turning ignition switch
“ON”.
Battery voltage should exist after
turning ignition switch “ON”.
OK
E
NG
Check warning lamp bulb.
OK
Repair harness and con-
nectors between fuse box
and ABS/TCS control unit
connector terminal
q
22
(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
q
22
and
ABS actuator 8-pin connector (body
side) terminal
q
11
.
Continuity should exist.
OK
E
NG
Repair harness and con-
nectors between ABS
warning lamp (combination
meter) and ABS actuator
8-pin connector (body side)
terminal
q
11
.
1. Disconnect ABS actuator 8-pin connec-
tor.
2. Check continuity between ABS actuator
harness 8-pin connector (body side)
terminal
q
21
and body ground.
Continuity should exist.
OK
E
NG
Repair harness and con-
nectors.
q
A
(Go to next page.)
TROUBLE DIAGNOSES FOR SYMPTOMS
H
H
H
H
H
BR-114
SBR397E
SBR376E
q
A
1. Disconnect ABS actuator 8-pin connec-
tor.
2. Check continuity between ABS actuator
8-pin connector (ABS actuator side)
terminals
q
11
@
and
q
21
!
.
Continuity should exist.
Note: Pay attention to tester polarity*.
OK
E
NG
Replace ABS actuator.
CONTROL UNIT POWER SUPPLY CIR-
CUIT.
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Go to
in Diagnostic Procedure 26,
OK
E
NG
Repair harness and con-
nectors.
CHECK SOLENOID VALVE RELAY.
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
OK
E
NG
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
q
6
and
q
21
Battery voltage
not applied
between each
terminal
q
5
and
q
7
Yes
Battery voltage
applied
between each
terminal
q
5
and
q
7
No
Check resis-
tance between
each terminal
q
5
and
q
7
Approx. 100
Ω
GI
MA
EM
LC
EC
FE
AT
PD
FA
RA
ST
RS
BT
HA
EL
IDX
TROUBLE DIAGNOSES FOR SYMPTOMS
Diagnostic Procedure 25 (ABS warning lamp
does not come on when ignition switch is
turned on.) (Cont’d)
H
H
H
H
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
31
for control unit.
For fuse layout, refer to POWER SUPPLY
ROUTING in EL section.
OK
E
NG
q
B
(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.
OK
E
NG
Check the following.
I
Harness connector
B103
I
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.
OK
E
NG
Check the following.
I
Harness connectors
B103
,
F7
I
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
q
5
and
q
7
.
Continuity should exist.
OK
E
NG
Replace ABS actuator.
SOLENOID VALVE RELAY CHECK
----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Go to
in Diagnostic Procedure 25,
OK
E
NG
Replace ABS actuator.
q
A
(Go to next page.)
ABS/TCS control unit
ABS actuator
108
q
5
q
7
q
7
TROUBLE DIAGNOSES FOR SYMPTOMS
H
H
H
H
H
BR-116
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