Acura CSX. Manual — part 567
01
SNR9A00J46636200000CAAT00
22-315
System Description
Mechanical key
(Including transponder)
Immobilizer key
MICU
(Imoes circuit)
Mechanical key
Steering lock assembly
Immobilizer-keyless
control unit
ECM/PCM
Transmitter
(Including
transponder)
The vehicle is equipped with a type VI immobilizer system that will disable the vehicle unless a programmed ignition
key is used.
This system consists of a transponder combined with a keyless transmitter, immobilizer-keyless control unit, the MICU
(has built-in imoes unit), immobilizer indicator, and the ECM/PCM.
When the immobilizer key (programmed by the HDS) is inserted into the ignition switch and turned to ON (II), the
immobilizer-keyless control unit sends power to the transponder in the ignition key. The transponder then sends a
coded signal back to the immobilizer-keyless control unit which then sends a coded signal to the ECM/PCM and the
MICU (imoes unit). The ECM/PCM and MICU (imoes unit) identify this code signal, then fuel power is supplied.
NOTE: The transmitter is automatically programmed to the vehicle when a transponder is programmed by the HDS.
If the wrong key has been used or the code was not received or recognized by the unit, the indicator will come on for
about 2 seconds, then it will blink until the ignition switch is turned to LOCK (0). When the ignition switch is turned to
LOCK (0), the indicator will blink ten times to signal that the unit has reset correctly, then the indicator will go off.
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*01
SNR9A00J46636200000EAAT00
−
−
−
22-316
Immobilizer System
Circuit Diagram
LT GRN
PNK
R9
F8
LT GRN
28
21
PNK
F24
G2
D2
Q1
R12
PNK
R6
R16
PNK
BRN/YEL
C40
BRN/YEL
LG1
LG2
BRN/YEL
C44
B-CAN
Q6
G504
BLK
2
1
BRN/YEL
IG1
2
YEL
MICU
B-CAN
VBU
K-LINE
IGKEYSW
LG
7
BLK
BRN
IG1
C36
BLK/GRN
5
LT BLU
WHT
A44
B1
B36
PG2
PG1
BLK
G101
PNK
BRN
PNK
1
No. 2 (15 A)
WHT
KEY
IMOCD
ECM/PCM
UNDER-DASH FUSE/RELAY BOX
ORN
IG1
BAT
BLU
No. 23 (10 A)
UNDER-HOOD FUSE/RELAY BOX
No. 2 (IG) (50 A)
BATTERY
IGNITION SWITCH
No. 1 (BAT) (100 A)
IMMOBILIZER-KEYLESS CONTROL UNIT
6
3
4
PGM-FI
MAIN RELAY 2
(FUEL PUMP)
DATA LINK
CONNECTOR
IGNITION
KEY SWITCH
(Closed: Key inserted)
IG1 HOT in ON (II)
and START (III)
GAUGE CONTROL
MODULE (TACH)
UNDER-DASH
FUSE/RELAY BOX
IMMOBILIZER
INDICATOR
(LED)
PARKING
BRAKE
SWITCH
(Closed:
Lever pulled)
UNDER-DASH
FUSE/RELAY
BOX
D4
H1
1
: CAN line
: Other communication line
*1: ’06 07 models
*2: ’07 09 models
*3: ’08 09 models
ORN
IMOES UNIT
(Built into the MICU)
MICU
BLK*2
IMOCD
BLK/RED*1
BLK*3
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SNR9A00K742000Y1905FAAT00
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−
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DTC B1905:
YES
NO
YES
NO
22-317
DTC Troubleshooting
Immobilizer-Keyless Control Unit
Lost Communication with MICU (DRLOCKSW
Message)
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. Wait for 6 seconds or more.
4. Check for DTCs with the HDS.
Go to step 5.
Intermittent failure, the system is OK at this
time. Check for loose or poor connections at the
immobilizer-keyless control unit 7P connector, and
the under-dash fuse/relay box connector Q (16P).
5. Check for DTCs with the HDS.
Faulty MICU; replace the under-dash fuse/
relay box (see page 22-66).
Replace the immobilizer-keyless control unit
(see page 22-332).
Is DT C B1905 indicated?
Is DT C B1160 also indicated with DT C B1905?
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*01
SNR9AA1K742000Y1906FAAT00
−
−
−
−
−
−
−
−
DTC B1906:
YES
NO
YES
NO
YES
NO
YES
NO
22-318
Immobilizer System
GAUGE CONTROL MODULE (TACH) 36P CONNECTOR
B-CAN (PNK)
B-CAN (PNK)
IMMOBILIZER-KEYLESS CONTROL UNIT 7P CONNECTOR
Immobilizer-Keyless Control Unit
Lost Communication with Gauge Control
Module (A/T Message)
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. Wait for 6 seconds or more.
4. Check for DTCs with the HDS.
Go to step 5.
Intermittent failure, the system is OK at this
time. Check for loose or poor connections at the
gauge control module (tach) 36P connector and at
the immobilizer-keyless control unit 7P
connector.
5. Turn the ignition switch to LOCK (0), and then back
to ON (II).
6. Select the BODY ELECTRICAL menu, then enter the
UNIT INFORMATION.
7. Check the condition of the gauge control module
(tach) from the CONNECTED UNIT list.
Go to step 8.
Replace the immobilizer-keyless control unit
(see page 22-332).
8. Do the gauge control module (tach) input test
(see page 22-271).
Go to step 9.
Repair the faulty input, then recheck the
DTCs.
9. Disconnect the immobilizer-keyless control unit 7P
connector.
10. Disconnect the gauge control module (tach) 36P
connector.
11. Check for continuity between immobilizer-keyless
control unit 7P connector terminal No. 4 and gauge
control module (tach) 36P connector terminal
No. 21.
Replace the gauge control module (tach)
(see page 22-277).
Repair an open in the wire between the
immobilizer-keyless control unit and the gauge
control module (tach).
Wire side of female terminals
Wire side of female terminals
Is DT C B1906 indicated?
Is NOT AV AILABLE indicated?
Ar e all inputs OK ?
Is ther e continuity?
08/08/21 14:36:58 61SNR030_220_0320
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