2006 ACURA CSX ignition

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DTC B1906:
YES
NO
YES
NO
YES
NO YES
NO
22-318Immobilizer System
DTC Troubleshooting (cont’d)
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 immob
ilizer-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 DTC B1906 indicated?
Is NOT AV AILABLE indicated?Are all inputs OK ? Is there continuity?
08/08/21 14:36:58 61SNR030_220_0320
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DTC B1925:
YES
NO YES
NO
YES
NO
22-319
IGNITION KEY SWITCH 6P CONNECTOR
GND
IG KEY SW
IGNITION KEY SWITCH 6P CONNECTOR GND
IG KEY SW
Ignition Key Switch Signal Error
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).
 If the vehicle is equipped with an ACURA ACCESSORY remote starter, this DTC is normal no
further diagnosis is necessary.
1. Clear the DTCs with the HDS.
2. Turn the ignition switch to LOCK (0) and remove the ignition key.
3. Insert the ignition key into the ignition switch, and turn the ignition switch to ON (II).
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 c onnector,
under-dash fuse/relay box 20P connector R, and at
the ignition key switch 6P connector.
5. Turn the ignition switch to LOCK (0) and remove the ignition key.
6. Disconnect the ignition key switch 6P connector. 7. At the ignition key switch side, check for continuity
between ignition key switch 6P connector terminals
No. 1 and No. 2.
Faulty ignition key switch or short to ground,
replace the steering lock assembly (see page 17-14).
Go to step 8.
8. Insert the ignition key into the ignition switch.
9. At the ignition key switch side, check for continuity between ignition key switch 6P connector terminals
No. 1 and No. 2.
Go to step 10.
Faulty ignition key switch, replace the
steering lock assembly (see page 17-14).
(cont’d)
Terminal side of male terminals
Terminal side of male terminals
Is DTC B1925 indicated? Is there continuity?
Is there continuity?
08/08/21 14:36:59 61SNR030_220_0321
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YES
NO YES
NO
22-320Immobilizer System
DTC Troubleshooting (cont’d)
IGNITION KEY SWITCH 6P CONNECTOR
IMMOBILIZER-KEYLESS CONTROL UNIT 7P CONNECTOR IG KEY SW (PNK)
IG KEY SW (PNK) IMMOBILIZER-KEYLESS CONTROL UNIT 7P CONNECTOR
IG KEY SW (PNK)
10. Disconnect the immobilizer-keyless control unit 7Pconnector.
11. Check for continuity between immobilizer-keyless control unit 7P connector terminal No. 6 and
ignition key switch 6P connector terminal No. 1.
Go to step 12.
Repair an open in the wire and check under-
dash fuse/relay box 20P connector R. 12. Check for continuity between immobilizer-keyless
control unit 7P connector terminal No. 6 and body
ground.
Repair a short to ground in the wire or
substitute a known-good under-dash fuse/relay box,
and recheck. If the symptom/indication goes away,
replace under-dash fuse/relay box.
Replace the immobilizer-keyless control unit
(see page 22-332).
Wire side of female terminals
Wire side of female terminals Wire side of female terminals
Is there continuity?
Is there continuity?
08/08/21 14:36:59 61SNR030_220_0322
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Symptom Troubleshooting by the Immobilizer Indicator Lighting Pattern
General Check before Troubleshooting
Normal operation
Immobilizer code is not identified
Immobilizer indicator does not come on
Immobilizer indicator does not go off
22-321
Symptom Troubleshooting Information
Immobilizer system condition can be checked by the immobilizer indicator lighting pattern.
If the immobilizer code is identified, the immobilizer indicator comes on for 2 seconds, then goes off after turning the
ignition switch to ON (II).
The immobilizer indicator does not come on when the ignition switch is turned to LOCK (0).
If the immobilizer code is not identified, the immobilizer indicator comes on for 2 seconds, then blinks after turning the
ignition switch to ON (II).
The immobilizer indicator blinks ten times, then goes off when the ignition switch is turned to LOCK (0).
If the immobilizer indicator does not come on after turning the ignition switch to ON (II), there may be an open or short
in the F-CAN lines between the ECM/PCM and the gauge control module (tach). Watch the malfunction indicator lamp
(MIL). If the MIL stays on, go to the PGM-FI system troubleshooting (see page 11- 203).
If the immobilizer indicator does not go off after turning the ignition switch to ON (II), do the gauge control m odule
(tach) self-diagnostic function (see page 22- 241). If the indicator drive circuit is OK, verify the SYSTEM CHECK with the
HDS.
Before troubleshooting the immobilizer system, check the following general points and solve any if applicable.
 Battery is low; charge the battery fully, then troubleshoot the immob ilizer system.
 Ignition key is not a genuine Honda part; use the Acura-approved key blank, register the key, then troubleshoot the immobilizer system.
 Key ring, or keys, or a key case is used; remove the key from it, and troubleshoot the immob ilizer system with a key
only.
 Aftermarket electrical part is attached; remove it, then troubleshoot the immob ilizer system.
(cont’d)
08/08/21 14:36:59 61SNR030_220_0323
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How to Troubleshoot
Symptom Troubleshooting of an open Power Supply and Ground Circuit
22-322Immobilizer System
Symptom Troubleshooting Information (cont’d)
Immobilizer
Indicator
Symptom
Line Error Engine StartKey
RegistrationTester
Communication
Keyless Operation
VBU line open
or short Comes on,
then goes off.
Possible
Possible Possible
Impossible
1
IG1 line open
or short Blinking Impossible
Impossible
Impossible
Possible
2
Blinking Impossible Impossible
Possible
Possible
IMOCD line
open or short
3
4 Immobilizer:
Possible
Keyless:
Impossible Impossible
Possible Possible
Comes on,
then goes off.
B-CAN line
open or short
Comes on,
then goes off. Impossible
Impossible
Possible
Possible
5
KEYSW line
short to groundGND (LG) line
open
6
7 (in spite of the key is
in the ignition switch)
Possible
Possible Possible Possible
Comes on,
then goes off.
KEYSW line
open
K-LINE line
open or short
Blinking Impossible Impossible
Impossible ImpossibleImpossible
Cause of
Malfunction
Terminal
No.
NOTE: If the HDS does not communicate with the vehicle, troubleshoot the DLC circuit (see page 11-
204).
1. Do the PGM-FI system DTCs check. If there are any DTCs, troubleshoot the indicated DTC.
2. Do the Body Electrical DTCs check. If there are any DTC, troubleshoot the indicated DTC.
3. Do the system check using the HDS. If there is a system check number, do the troubleshooting for the item indicated (see page 22-326).
4. Check the status log using the HDS. Troubleshoot the line with the highest counts (see page 22-328). If all the lines are ‘‘0’’ zero, the problem may not be caused by the immobilizer system, check for ignition or fuel problems.
NOTE: Once repaired, clear the status log by removing the back up power fuse, or disconnecting the battery.
If a malfunction occurs in the immobilizer circuit for the VBU, IG1 and GND (LG) lines, identify the lines to check with
this table.
08/08/21 14:37:00 61SNR030_220_0324
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Immobilizer indicator blinks
YES
NO
YES
NO YES
NO
YES
NO
22-324Immobilizer System
Symptom Troubleshooting (cont’d)
IMMOBILIZER-KEYLESS CONTROL UNIT 7P CONNECTOR
IG1 (YEL)
IMMOBILIZER-KEYLESS CONTROL UNIT 7P CONNECTOR LG (BLK)
NOTE: Before troubleshooting, check the items listed in
‘‘General Check before Troubleshooting’’.
1. Turn the ignition switch to LOCK (0).
2. Connect the HDS, then turn the ignition switch to ON (II).
3. Enter the IMMOBILIZER, then select the IMMOBILIZER SETUP.
4. Select the SYSTEM CHECK.
Troubleshoot the immob ilizer system
according to the result of the SYSTEM CHECK
(see page 22-326).
Go to step 5.
5. Turn the ignition switch to LOCK (0).
6. Enter the vehicle, and remove the ignition key from the ignition switch, then close the all doors.
7. Operate the keyless transmitter LOCK and UNLOCK several times in the vehicle.
Go to step 8.
Check for a poor ground (G 101) and/or an
open in the wire between immobilizer-keyless
control unit 7P connector terminal No. 7 and body
ground (G 101).
8. Turn the ignition switch to ON (II). 9. Measure the voltage between immobilizer-keyless
control unit 7P connector terminal No. 2 and body
ground.
Go to step 10.
Repair open in the YEL wire between the
under-dash fuse/relay box and the immob ilizer-
keyless control unit.
10. Measure the voltage between immobilizer-keyless control unit 7P connector terminal No. 7 and body
ground.
Repair poor connection or open between
immobilizer-keyless control unit 7P c onnector
terminal No. 7 and G101.
Replace the immobilizer-keyless control unit
(see page 22-332).
Wire side of female terminals
Wire side of female terminalsIs the SY ST EM CHECK indicated?
Do t he d oor l ock act uat or s w or k nor mal l y ? Is there battery voltage?
Is t her e 0.5 V or mor e?
08/08/21 14:37:00 61SNR030_220_0326
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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?
08/08/21 14:37:00 61SNR030_220_0327
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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.
08/08/21 14:37:00 61SNR030_220_0328
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