Suzuki Grand Vitara JB416 / JB420. Manual - part 420

10C-10 Immobilizer Control System:

DTC P1615: Steering Lock Unit Communication Error (for Vehicle with Keyless Start System)

S5JB0AA304014

Circuit Description
When the transponder code in the ignition key is registered in ECM, the remote controller ID code is registered in both
ECM and keyless start control module at the same time. This DTC is detected only in case that the remote controller
ID code cannot be registered in both ECM and keyless start control module when the transponder code in the ignition
key is registered in ECM.

NOTE

• Perform the troubleshooting for DTC P1618 first if both DTC P1615 and P1618 are detected at the

same time.

• After replacing ECM, be sure to register the transponder code in the ignition key with ECM referring

to “Registration of the Ignition Key”. After replacing the keyless start control module of the vehicle
equipped with the keyless start system, be sure to perform “Registration of the Ignition Key”.

Detecting Condition and Trouble Area

Registration of the ignition key in use with ECM and
Diagnostic Trouble Code (DTC) Check
1) There is a possibility that the unregistered ignition key is

used. Therefore, register the transponder code in the
transponder in the ignition key with ECM referring to
“Registration of the Ignition Key”.

2) Check if DTC P1614 is detected referring to “Diagnostic

Trouble Code (DTC) Check”.

Is DTC P1614 detected?

Go to Step 4.

The troubleshooting is
completed.

Registration of the new ignition key with ECM and
Diagnostic Trouble Code (DTC) check
1) The transponder in the ignition key is corrupted or the

ignition key without the transponder is used. Therefore,
prepare the new ignition key.

2) Register the transponder code in the transponder in the

new ignition key with ECM referring to “Registration of
the Ignition Key”.

3) Check if that DTC P1614 is detected referring to

“Diagnostic Trouble Code (DTC) Check”.

Is DTC P1614 detected?

Go to Step 5.

The troubleshooting is
completed.

Immobilizer control module (ICM) check
1) Check immobilizer control module (ICM) referring to

“Inspection of Immobilizer Control Module (ICM) and Its
Circuit”.

Is immobilizer control module (ICM) normal?

Replace ECM with new
one referring to “Engine
Control Module (ECM)
Removal and
Installation in Section
1C”, and then perform
“Procedure after ECM
Replacement”.

Replace immobilizer
control module (ICM)
with new one referring
to “Immobilizer Control
Module (ICM) Removal
and Installation”.

Step

Action

Yes

Detecting Condition

Trouble Area

• While registering the transponder code in ECM, the

keyless start control module sent a signal to ECM
indicating that the remote controller ID code could not
be registered.

• The remote controller ID code could not be registered in

the keyless start control module or ECM. And, the
registration of the transponder code in ECM was
terminated forcibly.

• Wire circuits between steering lock unit and keyless

start control unit open or shorted

• CAN communication wire circuits faulty
• Steering lock unit faulty
• Keyless start control module faulty
• ECM faulty

Immobilizer Control System: 10C-11

Troubleshooting

Step

Action

Yes

Diagnostic Trouble Code (DTC) confirmation
1) Clear DTC(s) referring to “Diagnostic Trouble Code

(DTC) Clearance”.

2) Turn the ignition switch to OFF position.
3) Check if any DTC is detected referring to “Diagnostic

Trouble Code (DTC) Check”.

Is DTC P1615 still detected?

Go to Step 2.

The troubleshooting is
completed.

Registration of the ignition key
1) Turn the ignition switch to OFF position.
2) Turn the ignition switch to ON position, and register the

transponder code in the transponder in the ignition key
with ECM referring to “Registration of the Ignition Key”.

Was it possible to register the ignition key (transponder
code) in ECM?

The troubleshooting is
completed.

Go to Step 3.

Diagnostic Trouble Code (DTC) check
1) Check if any DTC is detected referring to “Diagnostic

Trouble Code (DTC) Check”.

Is any DTC detected?

Go to Step 4.

Replace ECM with a
known-good one and
recheck.

Diagnostic Trouble Code (DTC) check

Is any DTC other than P1615 detected in Step 3?

Perform the
troubleshooting
referring to the
corresponding
flowchart.

Go to Step 5.

Steering lock unit check
1) Turn on the engine start knob of the keyless start

system.

Is the engine start knob at ON position?

Replace the steering
lock unit with a known-
good one and recheck.

Go to Step 6.

Steering lock unit operation check
1) Check the steering lock unit for operation referring to

“Ignition Switch Inspection in Section 9C”.

Does the engine start knob operate as specified?

Go to Step 7.

Replace the steering
lock unit referring to
“Steering Lock
Assembly (Ignition
Switch) Removal and
Installation in Section
6B”.

Check for open in wire circuits between steering lock
unit and keyless start control module
1) Disconnect steering lock unit connector “G22” and

keyless start control module connector “G42”.

2) Measure resistance at the following connector terminals.

• Between “G22-3” terminal of steering lock unit

connector and “G42-20” terminal of keyless start
control module connector.

• Between “G22-7” terminal of steering lock unit

connector and “G42-29” terminal of keyless start
control module connector.

• Between “G22-8” terminal of steering lock unit

connector and “G42-30” terminal of keyless start
control module connector.

Is each resistance 1

Ω

or less?

Go to Step 8.

Repair open or high
resistance in
malfunctional wire
circuit.

10C-12 Immobilizer Control System:

Check for short of wire circuits between steering lock
unit and keyless start control module
1) Measure resistance at the following connector terminals.

• Between “G22-3”, “G22-7” and “G22-8” terminal of

steering lock unit connector.

• Between “G42-20”, “G42-29” and “G42-30” terminal of

keyless start control module.

Is each resistance infinity?

Go to Step 9.

Make sure of insulation
of each wire circuit.

Check for short to ground wire circuit in wire circuits
between steering lock unit and keyless start control
module
1) Measure resistance at the following connector terminals.

• Between “G22-3” terminal of steering lock unit

connector and vehicle body ground.

• Between “G22-7” terminal of steering lock unit

connector and vehicle body ground.

• Between “G22-8” terminal of steering lock unit

connector and vehicle body ground.

• Between “G42-20” terminal of keyless start control

module connector and vehicle body ground.

• Between “G42-29” terminal of keyless start control

module connector and vehicle body ground.

• Between “G42-30” terminal of keyless start control

module connector and vehicle body ground.

Is each resistance infinity?

Go to Step 10.

Repair short to ground
wire circuit in
malfunctional wire
circuit.

10 Check for short to power supply wire circuit in wire

circuits between steering lock unit and keyless start
control module
1) Measure voltage at the following connector terminals

with ignition switch turned ON.
• Between “G22-3” terminal of steering lock unit

connector and vehicle body ground.

• Between “G22-7” terminal of steering lock unit

connector and vehicle body ground.

• Between “G22-8” terminal of steering lock unit

connector and vehicle body ground.

• Between “G42-20” terminal of keyless start control

module connector and vehicle body ground.

• Between “G42-29” terminal of keyless start control

module connector and vehicle body ground.

• Between “G42-30” terminal of keyless start control

module connector and vehicle body ground.

Is each voltage 0 – 1 V?

Replace keyless start
control module with a
known-good one and
recheck. If DTC P1615
is still detected, replace
ECM with a known-good
one and recheck.

Repair short to power
supply wire circuit in
malfunctional wire
circuit.

Step

Action

Yes

Immobilizer Control System: 10C-13

DTC P1616: Unregistered Keyless Start Control Module (for Vehicle with Keyless Start System)

S5JB0AA304015

Circuit Description
P1616 is detected when ECM detects different ID codes registered in ECM and keyless control module after turning
engine start knob to ON position. Normally, when keyless start control module is replaced with new one, ECM
automatically registers the applicable code in keyless start control module after turning ignition switch to ON position.
However, when keyless start control module is replaced with used one, ECM does not automatically register the
applicable code in keyless start control module even if ignition switch is turned to ON position.

Detecting Condition and Trouble Area

Troubleshooting

DTC P1618: Keyless Start Control Module CAN Communication Error (for Vehicle with Keyless Start
System)

S5JB0AA304016

Detecting Condition and Trouble Area

Detecting Condition

Trouble Area

ECM detects different ID codes registered in ECM and
keyless control module.

• Keyless start control unit faulty
• ECM faulty

Step

Action

Yes

Diagnostic Trouble Code (DTC) confirmation
1) Clear DTC(s) referring to “Diagnostic Trouble Code

(DTC) Clearance”.

2) Turn the ignition switch to OFF position.
3) Check if any DTC is detected referring to “Diagnostic

Trouble Code (DTC) Table”.

Is DTC P1616 still detected?

Go to Step 2.

The troubleshooting is
completed.

Registration of the ignition key
1) Clear DTC referring to “Diagnostic Trouble Code (DTC)

Clearance”.

2) Register the transponder code in the transponder in the

ignition key with ECM referring to “Registration of the
Ignition Key”.

Was it possible to register the ignition key (transponder
code) in ECM?

Go to Step 3.

Go to Step 4.

Keyless start system operation check
1) Start engine using keyless start system.

Does engine start?

The troubleshooting is
completed.

Check if any DTC is
detected by ECM. If
detected, perform the
troubleshooting
referring to the
corresponding
flowchart.

Diagnostic Trouble Code (DTC) check
1) Check ECM for DTC referring to “Diagnostic Trouble

Code (DTC) Check”.

Are DTC P1618 and/or P1615 detected other than P1616?

Go to DTC P1618
troubleshooting.

Go to DTC P1615
troubleshooting.

Detecting Condition

Trouble Area

Reception error of communication data for keyless start
control module is detected for longer than specified time
continuously.

• CAN communication wire circuits faulty
• Keyless start control module faulty
• ABS faulty
• ECM faulty

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