2006 ACURA CSX immobilizer

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Engine does not start with the immobilizer
key Immobilizer indicator does not go off
YES
NO
YES
NO
YES
NO
YES
NO
YES
NO YES
NO
22-32522-325
NOTE: Before troubleshooting, check the items listed in
‘‘General Check before Tr
oubleshooting’’ and ‘‘How to
Troubleshoot’’ (see page 22-322).
1. Try to start the engine.
Intermittent failure, the system is OK at this
time. Check status log (see page 22-328).
Go to step 2.
2. Turn the ignition switch to LOCK (0).
3. Turn the ignition switch to ON (II), and check the immobilizer indicator.
Go to step 4.
Go to the immobilizer indicator blinks
troubleshooting (see page 22- 324).
4. Turn the ignition switch to START (III).
Go to step 5.
Go to Starting System and check the starter
motor (see page 4-6).
5. Try to start the engine with the immobilizer key.
Go to step 6.
Go to the PGM-FI System Symptom
Troubleshooting.
6. Wait for a few minutes with the engine running.
Go to the PGM-FI System Symptom
Troubleshooting.
The system is OK at this time. 1. Turn the ignition switch to LOCK (0).
2. Connect the HDS to the data link connector.
3. Turn the ignition switch to ON (II).
4. Enter IMMOBILIZER, then select the IMMOBILIZER
INFORMATION.
5. Do the SYSTEM CHECK with the HDS.
Replace the gauge control module (tach)
(see page 22-277).
Substitute a known-good immobilizer-keyless
control unit, then register it and recheck. If the
symptom goes away, replace the original
immobilizer-keyless control unit (see page 22-332).
Doestheenginestart?
Does t he i nd i cat or come on f or 2 second s, t hen gooff?
Does the starter motor run?Doestheenginestart?Doestheenginestop? Is N-1 OK indicated?
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Check No. System Check Possible Cause
22-326Immobilizer System
System Check
1. Connect the HDS to the data link connector.
2. Turn the ignition switch to ON (II).
3. Monitor the SYSTEM CHECK in the IMMOBILIZER INFO with the HDS.
4. If the HDS displays NORMAL N-1, the immobilizer system is OK at this time, refer to the STATUS LOG. If the HDS
displays any other messages, check as follows:





















A-1 The key is not
registered This key is not registered in the immobilizer-keyless control unit. Try
to register keys using the HDS.
No communication between the antenna and the immobilizer key
because of interference from metal such as key chains/key rings/
other keys.
Low battery voltage.
A-2 Communication error between the
key and
immobilizer unit Intermittent interruption between transponder and immobilizer-
keyless control unit.
The immobilizer key type is incorrect
non-Acura key.
Key failure (transponder failure)
No communication between the antenna and the immobilizer key
because of interference from metal such as key chains/key rings/
other keys.
Low battery voltage.
A-3 No communication between the key
and immobilizer
unit The ignition switch was turned to ON (II) with a non-immob
ilizer key.
The immobilizer key type is incorrect non-Acura key.
Key failure (transponder failure)
No communication between the antenna and the immobilizer key
because of interference from metal such as key chains/key rings/
other keys.
Low battery voltage.
Immobilizer-keyless control unit failure
B-1 The ECM/PCM is not registered The ECM/PCM was not registered. Try to register the ECM/PCM
using the HDS.
No communication between the ECM/PCM and the immobilizer-
keyless control unit because of low battery voltage.
No communication between the immobilizer-keyless control unit
and the ECM/PCM because of interference.
Open in the IG1 line
B-2 Error of communication
format in ECM/
PCM The ECM/PCM was not registered. Try to register the ECM/PCM
using the HDS.
No communication between the ECM/PCM and the immobilizer-
keyless control unit because of low battery voltage.
No communication between the immobilizer-keyless control unit
and the ECM/PCM because of interference.
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System
Check No. System Check Possible Cause
22-327























C-1 The imoes unit is
not registered Imoes unit was not registered.
No communication between the imoes unit and the immobilizer-
keyless control unit because of low battery voltage.
No communication between the imoes unit and the immobilizer-
keyless control unit because of interference.
C-2 Error of communication
format in imoes
unit Imoes unit was not registered.
No communication between the imoes unit and the immobilizer-
keyless control unit because of low battery voltage.
No communication between the imoes unit and the immobilizer-
keyless control unit because of interference.
D-1 S-net line short Harness short from the ECM/PCM to the immobilizer-keyless control unit. (IMOCD (S-net) line short)
No communication between the ECM/PCM and the immobilizer-
keyless control unit because of low battery voltage.
No communication between the immobilizer-keyless unit and the
ECM/PCM because of interference.
Immobilizer-keyless control unit failure
ECM/PCM failure
D-2 No communication between imoes
unit and
immobilizer unit Blown fuse
Harness open from the imoes unit to the immobilizer-keyless control
unit. (IMOCD (S-net) line open)
No communication between the imoes unit and the immobilizer-
keyless control unit because of low battery voltage.
No communication between the imoes unit and the immobilizer-
keyless control unit because of interference.
Immobilizer-keyless control unit failure
Imoes unit failure
D-3 No communication between ECM/PCM
and immobilizer
unit Blown fuse
Harness open from the ECM/PCM to the immobilizer-keyless control
unit.
No communication between the ECM/PCM and the immobilizer-
keyless control unit because of low battery voltage.
No communication between the immobilizer-keyless control unit
and the ECM/PCM because of interference.
Immobilizer-keyless control unit failure
ECM/PCM failure
E-1 Initial registration of immobilizer unit
is not completed The immobilizer-keyless control unit is not registered. Try to register
the immobilizer-keyless control unit using the HDS.
E-2
E-3
E-4
E-5
F-1 Special Mode Turn the ignition switch to ON (II) and to LOCK (0) with the registered key.
F-2
F-3
F-4
F-5
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Status Log No.Detected Item Probable Cause
22-328Immobilizer System
Status Log
If you suspect there is a immobilizer system problem, check the status log in the HDS.
1. Connect the HDS to the data link connector.
2. Turn the ignition switch to ON (II).
3. On the HDS screen, at MAIN MENU, enter IMMOBILIZER, then select IMMOBILIZER SET-UP, select IMMOBILIZER INFORMATION, then select STATUS LOG.
4. Check the STATUS LOG count. Troubleshoot the status with the highest count first. If no counts are listed, the immobilizer system is OK. Continue with normal symptom troubleshooting.






































A-1 KEY CODE MISMATCH
(Code format normal, but code
data is mismatch) The key was not registered
Interference from metal such as key chains
Low battery voltage
A-2 KEY CODE MISMATCH (Code format failure) Ignition switch was turned to ON (II) with another type of immobilizer key or
aftermarket key
Interference from metal such as key chains
Low battery voltage
A-3 KEY CODE MISMATCH (No key code or non-
immobilizer key) Ignition switch was turned to ON (II) with another type of immobilizer key or
aftermarket key
Interference from metal such as key chains
Low battery voltage
Key failure
Immobilizer-keyless control unit failure
B-1 ECM/PCM CODE MISMATCH (Code format normal, but code
data is mismatch) ECM/PCM was not registered correctly
Low battery voltage
Poor or loose terminal connections at the immobilizer-keyless control unit
Communication line electrical noise
B-2 ECM/PCM MISMATCH (Code format failure) ECM/PCM was not registered correctly
Low battery voltage
Poor or loose terminal connections at the immobilizer-keyless control unit
Communication line electrical noise
C-1 IMOES UNIT mismatch (Code format normal, but data is
mismatch) Imoes unit was not registered
The communication was not good between imoes unit and immobilizer unit
by battery voltage low
The communication was not good between imoes unit and immobilizer unit
by influence of some noise
C-2 IMOES UNIT mismatch (Code format failure) Imoes unit was not registered correctly
The communication was not good between imoes unit and immobilizer unit
by battery voltage low
The communication was not good between imoes unit and immobilizer unit
by influence of some noise
D-1 SECURITY-NET LINE PROBLEM IMOCD (S-NET)
(Short to ground) Low battery voltage
Poor or loose terminal connections at the immobilizer-keyless control unit and
the ECM/PCM
Communication line electrical noise
D-2 SECURITY-NET LINE PROBLEM (No communication) Blown fuse
Harness open from imoes unit to immobilizer unit
The communication was not good between imoes unit and immobilizer unit
by battery voltage low
The communication was not good between imoes unit and immobilizer unit
by influence of some noise
Imoes unit failure
Immobilizer unit failure
D-3 SECURITY-NET LINE PROBLEM IMOCD (S-NET)
(Open line or ECM/PCM failure) Open or short in the harness from the ECM/PCM to the immobilizer-keyless
control unit
Low battery voltage
Poor or loose terminal connections at the immobilizer-keyless control unit and
the ECM/PCM
Communication line electrical noise
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Add one new key/Keyless transmitter
Add and Delete keys/Keyless transmitters,
Then select Delete or Add keysAll keys are lost
Programming immobilizer-keyless control
unit
22-329
Immobilizer Key Registration
NOTE:
 The HDS is required for registration of the immobilizer keys.
 Programming the immobilizer also programs the keyless transmitter.
 Check for aftermarket electrical equipment that can cause problems with transponder operation.
 The immobilizer-keyless control unit can store up to six immobilizer keys.
1. Have a registered key, a new immobilizer key, and the first password from the iN system.
2. Connect the HDS to the data link connector.
3. Turn the ignition switch to ON (II).
4. Select IMMOBILIZER from the SYSTEM SELECT menu.
5. Select Add and Delete keys, then Add 1 key.
6. Do the registration according to the instructions on the HDS screen.
7. Check if the engine can be started with the newly registered key.
8. When prompted by the HDS, do the keyless transmitter programming.
1. Have all registered keys, all new keys, and the first password from the iN system.
2. Connect the HDS to the data link connector.
3. Turn the ignition switch to ON (II).
4. Select IMMOBILIZER from the SYSTEM SELECT menu.
5. Select Add and Delete Keys, or Delete or Add Multiple Keys.
6. Do the registration according to the instructions on the HDS screen.
7. Check if the engine can be started with all the registered keys. 8. When prompted by the HDS, do the keyless
transmitter programming.
1. Prepare all new keys and have the immobilizer ECM/PCM code.
2. Connect the HDS to the data link connector.
3. Turn the ignition switch to ON (II).
4. Select IMMOBILIZER from the SYSTEM SELECT menu.
5. Select Add and Delete keys, then ALL KEYS LOST.
6. Do the registration according to the instructions on the HDS screen.
7. Check if the engine can with started by all the registered keys.
8. When prompted by the HDS, do the keyless transmitter programming.
1. Have all registered keys and the ECM/PCM code.
2. Connect the HDS to the data link connector.
3. Turn the ignition switch to ON (II).
4. Select IMMOBILIZER from the SYSTEM SELECT menu.
5. Select REPLACE IMMOBILIZER/KEYLESS CONTROL UNIT REPLACE.
6. Do the registration according to the instructions on the HDS screen.
7. Check that the engine can be started with all registered keys.
8. When prompted by the HDS, do the keyless transmitter programming.
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22-330Immobilizer System
Immobilizer-keyless Control Unit Input Test
WHT
BLK
PNK
YEL AB
NOTE: Before testing the immobilizer system, troubleshoot the system using B-CAN System Diagnosis Test Mode A
(see page 22-93) and check the No. 10 (7.5 A) and No. 38 (30 A) fuses in the under-dash fuse/relay box.
1. Remove the driver’s dashboard lower cover (see page 20- 102).
2. Remove the steering column covers (see page 17-9).
3. Disconnect the 7P connector (A) from the immob ilizer-keyless control unit (B).
4. Inspect the connector and socket terminals to be sure they are all making good contact.  If the terminals are bent, loose or corroded, repair them as necessary, and recheck the system.
 IftheterminalslookOK,gotostep5.
Wire side of female terminals
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Cavity Wire Test conditionTest: Desired result Possible cause if desired result
is not obtained
Cavity Wire Test condition Test: Desired result Possible cause if desired result
is not obtained
22-331
5. With the connector still disconnected, do these input tests at the following connector.
 If any test indicates a problem, find and correct the cause, then recheck the system.
 If all the input tests prove OK, go to step 6.




1 ORN Under all
conditions Measure the voltage between
immobilizer-keyless control unit
7P connector terminals No. 1
and body ground:
There should be battery voltage. Blown No. 23 (10 A) fuse in
the under-hood fuse/relay
box
An open in the wire
2 YEL Ignition switch ON (II) Measure the voltage to ground:
There should be battery voltage. Blown No. 2 (15 A) fuse in the
under-dash fuse/relay box
An open in the wire
6. Reconnect the connector to the immob ilizer-keyless control unit, and do these input tests at the following
connector.
 If any test indicates a problem, find and correct the cause, then recheck the system.
 If all the input tests prove OK, the immobilizer-keyless control unit must be faulty; replace it.





7 BLK Under all
conditions Measure the voltage to ground:
There should be less than 0.5 V. Poor ground (G101)
An open in the wire
6 PNK Ignition key inserted into the
ignition switch Measure the voltage to ground:
There should be less than 1 V.
Poor ground (G504)
Faulty ignition key switch
An open in the wire
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22-332Immobilizer System
Immobilizer-keyless Control Unit Replacement
A
B
1. Remove the driver’s dashboard lower cover
(see page 20-102).
2. Remove the steering column covers (see page 17-9).
3. Disconnect the 7P connector (A) from the immobilizer-keyless control unit (B).
4. Remove the two screws and the immobilizer- keyless control unit.
5. Install the immobilizer-keyless control unit in the reverse order of removal.
6. After replacement, register the immobilizer-keyless control unit (see page 22-329), and make sure the
immobilizer system works properly.
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