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Acura CSX. Manual - part 568

０１

０２

ＳＮＲ９Ａ００Ｋ７４２０００Ｙ１９２５ＦＡＡＴ００

−

DTC B1925:

YES

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 connector,
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).

Terminal side of male terminals

Is DT C B1925 indicated?

Is ther e continuity?

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０３

０４

−

YES

22-320

Immobilizer System

IGNITION KEY SWITCH 6P CONNECTOR

IMMOBILIZER-KEYLESS CONTROL UNIT 7P CONNECTOR

IG KEY SW (PNK)

IMMOBILIZER-KEYLESS CONTROL UNIT 7P CONNECTOR

IG KEY SW (PNK)

10. Disconnect the immobilizer-keyless control unit 7P

connector.

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

Is ther e continuity?

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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 module
(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 immobilizer 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 immobilizer system with a key

only.

• Aftermarket electrical part is attached; remove it, then troubleshoot the immobilizer system.

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＊０１

How to Troubleshoot

Symptom Troubleshooting of an open Power Supply and Ground Circuit

22-322

Immobilizer System

Immobilizer
Indicator

Symptom

Line Error

Engine Start

Key
Registration

Tester
Communication

Keyless Operation

VBU line open
or short

Comes on,
then goes off.

Possible

Impossible

IG1 line open
or short

Blinking

Impossible

Possible

Blinking

Impossible

Possible

IMOCD line
open or short

Immobilizer:
Possible

Keyless:
Impossible

Impossible

Possible

Comes on,
then goes off.

B-CAN line
open or short

Comes on,
then goes off.

Impossible

Possible

KEYSW line
short to ground

GND (LG) line
open

(in spite of the key is
in the ignition switch)

Possible

Comes on,
then goes off.

KEYSW line
open

K-LINE line
open or short

Blinking

Impossible

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.

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