Infiniti QX56 (JA60). Manual — part 13
B2126 DETENT SW
ADP-43
< COMPONENT DIAGNOSIS >
C
D
E
F
G
H
I
K
L
M
A
B
ADP
N
O
P
NO
>> GO TO 3
3.
CHECK A/T SHIFT SELECTOR (PARK POSITION SWITCH) HARNESS
1. Turn ignition switch OFF.
2. Disconnect A/T shift selector and driver seat control unit.
3. Check continuity between driver seat control unit connector
B202 (A) terminal 21 and A/T shift selector connector M203 (B)
terminal 6.
4. Check continuity between driver seat control unit connector
B202 (A) terminal 21 and ground.
Is the inspection result normal?
YES
>> GO TO 4
NO
>> Repair or replace harness.
4.
CHECK PARK POSITION SWITCH
Check continuity between A/T shift selector (park position switch)
terminals as follows.
Is the inspection result normal?
YES
>> GO TO 5
NO
>> Replace A/T shift selector. Refer to
Selector Removal and Installation"
.
5.
CHECK INTERMITTENT INCIDENT
GI-38, "Intermittent Incident"
.
Is the inspection result normal?
YES
>> Replace driver seat control unit. Refer to
ADP-174, "Removal and Installation"
NO
>> Repair or replace the malfunctioning part.
6 - 21
: Continuity should exist.
21 - Ground
: Continuity should not exist.
ALJIA0194ZZ
Terminals
Condition
Continuity
5
6
P position
Yes
Other than P position
No
ALJIA0486ZZ
ADP-44
< COMPONENT DIAGNOSIS >
B2128 UART COMMUNICATION LINE
B2128 UART COMMUNICATION LINE
Description
INFOID:0000000005147474
Driver seat control unit performs UART communication with the automatic drive positioner control unit using 2
communication lines, TX and RX line. Driver seat control unit receives the operation signals of pedal adjusting
switch, door mirror remote control switch, set switch and memory switch and the position signals of adjustable
pedal sensor and door mirror sensor from the automatic drive positioner control unit and transmits the opera-
tion request signal.
DTC Logic
INFOID:0000000005147475
DTC DETECTION LOGIC
DTC CONFIRMATION PROCEDURE
1.
STEP 1
Turn ignition switch ON.
>> GO TO 2
2.
STEP 2
Operate pedal adjusting switch for more than 2 seconds.
>> GO TO 3
3.
PROCEDURE 3
Check “Self diagnostic result” with CONSULT-III.
Is the DTC detected?
YES
>> Perform diagnosis procedure. Refer to
NO
>> Inspection End.
Diagnosis Procedure
INFOID:0000000005147476
Regarding Wiring Diagram information, refer to
1.
CHECK UART COMMUNICATION LINE CONTINUITY
1. Turn ignition switch OFF.
2. Disconnect driver seat control unit and automatic drive posi-
tioner control unit.
3. Check continuity between driver seat control unit harness con-
nector and automatic drive positioner control unit harness con-
nector.
DTC No.
Trouble diagnosis name
DTC detecting condition
Possible cause
B2128
UART COMM
The communication between driver seat control unit
and automatic drive positioner control unit is interrupt-
ed for a period of time.
• UART communication line
(UART communication line is
open or shorted)
• Driver seat control unit
• Automatic drive positioner
control unit
Driver seat control
unit connector
Terminal
Automatic drive positioner
control unit connector
Terminal
Continuity
PIIA4598E
B2128 UART COMMUNICATION LINE
ADP-45
< COMPONENT DIAGNOSIS >
C
D
E
F
G
H
I
K
L
M
A
B
ADP
N
O
P
4. Check continuity between driver seat control unit harness connector and ground.
Is the inspection result normal?
YES
>> Check intermittent incident. Refer to
GI-38, "Intermittent Incident"
.
NO
>> Repair or replace harness.
B202
1
M33
10
Yes
17
26
Driver seat control unit con-
nector
Terminal
Ground
Continuity
B202
1
No
17
ADP-46
< COMPONENT DIAGNOSIS >
POWER SUPPLY AND GROUND CIRCUIT
POWER SUPPLY AND GROUND CIRCUIT
BCM
BCM : Diagnosis Procedure
INFOID:0000000005370325
Regarding Wiring Diagram information, refer to
.
1.
CHECK FUSES AND FUSIBLE LINK
Check that the following fuses and fusible link are not blown.
Is the fuse blown?
YES
>> Replace the blown fuse or fusible link after repairing the affected circuit.
NO
>> GO TO 2
2.
CHECK POWER SUPPLY CIRCUIT
1. Turn ignition switch OFF.
2. Disconnect BCM.
3. Check voltage between BCM harness connector and ground.
Is the measurement value normal?
YES
>> GO TO 3
NO
>> Repair or replace harness.
3.
CHECK GROUND CIRCUIT
Terminal No.
Signal name
Fuses and fusible link No.
57
Battery power supply
22 (15A)
70
F (50A)
11
Ignition ACC or ON
4 (10A)
38
Ignition ON or START
59 (10A)
Connector
Terminals
Power
source
Condition
Voltage (V) (Ap-
prox.)
(+)
(-)
M18
11
Ground
ACC
power
supply
Ignition
switch
ACC or
ON
Battery voltage
38
Ground
Ignition
power
supply
Ignition
switch ON
or START
Battery voltage
M20
57
Ground
Battery
power
supply
Ignition
switch
OFF
Battery voltage
70
Ground
Battery
power
supply
Ignition
switch
OFF
Battery voltage
LIIA2415E
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