Acura CSX. Manual — part 518
01
02
−
−
−
−
YES
NO
YES
NO
22-122
Keyless/Power Door Locks/Security System
UNDER-DASH FUSE/RELAY BOX CONNECTOR T (34P)
LOCK
(ORN)
UNLOCK (BRN)
UNDER-DASH FUSE/RELAY BOX CONNECTOR T (34P)
LOCK
(ORN)
UNLOCK (BRN)
9. Turn the ignition switch to LOCK (0).
10. Disconnect under-dash fuse/relay box connector T
(34P).
11. Check for continuity between under-dash fuse/relay
box connector T (34P) terminals No. 31 (UNLOCK)
and No. 32 (LOCK) and body ground.
Faulty MICU, replace the under-dash fuse/
relay box (see page 22-66).
Go to step 12.
12. Turn the ignition switch to LOCK (0).
13. Disconnect the driver’s door lock actuator 10P
connector.
14. Disconnect under-dash fuse/relay box connector T
(34P).
15. Check for continuity between under-dash fuse/relay
box connector T (34P) terminals No. 31 (UNLOCK)
and No. 32 (LOCK).
Repair a short in the wire between the LOCK
and UNLOCK wires.
Substitute a known-good MICU, and recheck.
If the symptom/indication goes away, replace the
original MICU, if not, replace the driver’s door lock
actuator.
Wire side of female terminals
Wire side of female terminals
Is ther e continuity?
Is ther e continuity?
08/08/21 14:26:02 61SNR030_220_0124
01
SNR9A00K763000Y1128FAAT00
−
−
−
−
−
−
−
−
DTC B1128:
YES
NO
YES
NO
YES
NO
YES
NO
22-123
UNDER-DASH FUSE/RELAY BOX CONNECTOR T (34P)
LOCK (GRN)
UNLOCK (GRY)
Driver’s Door Lock Switch Signal
Error (LOCK/UNLOCK)
NOTE: If you are troubleshooting multiple DTCs, be
sure to follow the instructions in B-CAN System
Diagnosis Test Mode A (see page 22-93).
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back
to ON (II).
3. Operate the driver’s door lock switch LOCK/
UNLOCK several times.
4. Check for DTCs with the HDS.
Go to step 5.
Intermittent failure. The driver’s door lock
system is OK at this time.
5. With the driver’s door lock switch in the neutral
position, select KEYLESS from the HDS and enter
the DATA LIST.
6. Check the ON/OFF information of the DRIVER’S
DOOR LOCK SWITCH (LOCK) and DRIVER’S DOOR
LOCK SWITCH (UNLOCK) in the DATA LIST.
Go to step 12.
Go to step 7.
7. Disconnect the driver’s power window master
switch 22P connector.
8. Check the ON/OFF information of the DRIVER’S
DOOR LOCK SWITCH (LOCK) and DRIVER’S DOOR
LOCK SWITCH (UNLOCK) in the DATA LIST.
Faulty door lock switch; replace the driver’s
power window master switch (see page 22-219).
Go to step 9.
9. Turn the ignition switch to LOCK (0).
10. Disconnect under-dash fuse/relay box connector T
(34P).
11. Check for continuity between under-dash fuse/relay
box connector T (34P) terminals No. 28 (LOCK) and
No. 27 (UNLOCK) and body ground.
Repair a short in the LOCK or UNLOCK
wire.
Faulty MICU, replace the under-dash fuse/
relay box (see page 22-66).
Wire side of female terminals
Is DT C B1128 indicated?
Ar e both inf or mation indicator s OF F ?
Ar e both inf or mation indicator s OF F ?
Is ther e continuity?
08/08/21 14:26:02 61SNR030_220_0125
02
SNR9A00K763000Y1129FAAT00
−
−
−
−
−
−
YES
NO
YES
NO
YES
NO
DTC B1129:
22-124
22-124
Keyless/Power Door Locks/Security System
UNDER-DASH FUSE/RELAY BOX CONNECTOR T (34P)
LOCK (GRN)
UNLOCK (GRY)
12. Turn the ignition switch to LOCK (0).
13. Disconnect the power window master switch 22P
connector.
14. Disconnect under-dash fuse/relay box connector T
(34P).
15. Check for continuity between under-dash fuse/relay
box connector T (34P) terminals No. 28 (LOCK) and
No. 27 (UNLOCK).
Repair a short in the wire between the LOCK
and UNLOCK wires.
Substitute a known-good power window
master switch, and recheck. If the symptom/
indication goes away, replace the original power
window master switch. If not, the MICU is faulty,
replace the under-dash fuse/relay box (see page
22-66).
NOTE: If you are troubleshooting multiple DTCs, be
sure to follow the instructions in B-CAN System
Diagnosis Test Mode A (see page 22-93).
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0), and then back
to ON (II).
3. Operate the driver’s door lock knob switch several
times.
4. Check for DTCs with the HDS.
Go to step 5.
Intermittent failure. The system is OK at this
time.
5. Select KEYLESS from the BODY ELECTRICAL menu,
and enter the DATA LIST.
6. Check the ON/OFF information of the DRIVER’S
DOOR LOCK KNOB SWITCH (LOCK) and the
DRIVER’S DOOR LOCK KNOB SWITCH (UNLOCK).
Faulty MICU, replace the under-dash fuse/
relay box (see page 22-66).
Go to step 7.
Driver’s Door Lock Knob Switch
Signal Error (LOCK/UNLOCK)
Wire side of female terminals
Is ther e continuity?
Is DT C B1129 indicated?
Is the DRIV ER’S DOOR LOCK K NOB SW IT CH
( LOCK ) inf or mation indicator ON and the
DRIV ER’S DOOR LOCK K NOB SW IT CH
( UNLOCK ) inf or mation indicator OF F with the
dr iver ’s door lock knob switch in the LOCK
position, and is the DRIV ER’S DOOR LOCK
K NOB SW IT CH ( LOCK ) inf or mation indicator
OF F and the DRIV ER’S DOOR LOCK K NOB
SW IT CH ( UNLOCK ) inf or mation indicator ON
with the dr iver ’s door lock knob switch in the
UNLOCK position?
08/08/21 14:26:02 61SNR030_220_0126
01
02
−
−
−
−
−
−
YES
NO
YES
NO
YES
NO
22-125
UNDER-DASH FUSE/RELAY BOX CONNECTOR T (34P)
LOCK (LT GRN)
UNLOCK (WHT)
UNDER-DASH FUSE/RELAY BOX CONNECTOR T (34P)
LOCK (LT GRN)
UNLOCK (WHT)
7. Disconnect the driver’s door lock actuator 10P
connector.
8. Check the ON/OFF information of the DRIVER’S
DOOR LOCK KNOB SWITCH (LOCK) and DRIVER’S
DOOR LOCK KNOB SWITCH (UNLOCK) in the
DATA LIST.
Check for an open in the driver’s door lock
knob switch (LOCK) wire or the driver’s door lock
knob switch (UNLOCK) wire between the MICU and
the driver’s door lock knob switch. If OK, replace
the driver’s door lock actuator.
Go to step 9.
9. Turn the ignition switch to LOCK (0).
10. Disconnect under-dash fuse/relay box connector T
(34P).
11. Check for continuity between under-dash fuse/relay
box connector T (34P) terminals No. 23 (UNLOCK)
and No. 24 (LOCK) and body ground.
Repair a short to ground in the LOCK or
UNLOCK wire.
Go to step 12.
12. Check for continuity between under-dash fuse/relay
box connector T (34P) terminals No. 23 (UNLOCK)
and No. 24 (LOCK).
Repair a short in the wire between the LOCK
wire and UNLOCK wire.
Faulty MICU, replace the under-dash fuse/
relay box (see page 22-66).
Wire side of female terminals
Wire side of female terminals
Ar e both inf or mation indicator s OF F ?
Is ther e continuity?
Is ther e continuity?
08/08/21 14:26:03 61SNR030_220_0127
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