Chrysler Town, Dodge Caravan. Manual — part 929

TEST

ACTION

APPLICABILITY

7

Turn the ignition off.
Measure the resistance of the Sensor Ground circuit at the Rear Intrusion Sensor
connector.
Is the resistance below 5.0 ohms?

All

Yes

→ Go To 8

No

→ Go To 9

8

Replace the Rear Intrusion Sensor with a known good sensor.
With the DRBIII

t, select Intrusion Sensor Test.

Turn the ignition on then wave arm inside the vehicle to simulate an intrusion.
Does the DRBIII

t show INTRUSION DETECTED?

All

Yes

→ Replace the Rear Intrusion Sensor.

Perform VTSS VERIFICATION TEST - 1A.

No

→ Replace the RKE/Thatcham Alarm Module.

Perform VTSS VERIFICATION TEST - 1A.

9

Gain access to the RKE/Thatcham Alarm Module.
Disconnect the Thatcham Alarm Module 16-way connector.
Measure the resistance of the Sensor Ground circuit between the Thatcham Alarm
Module connector and the Intrusion Sensor connector.
Is the resistance below 5.0 ohms?

All

Yes

→ Replace the RKE/Thatcham Alarm Module.

Perform VTSS VERIFICATION TEST - 1A.

No

→ Repair the Rear Sensor Ground circuit for an open.

Perform VTSS VERIFICATION TEST - 1A.

10

Turn the ignition off.
Gain access to the RKE/Thatcham Alarm Module 16-way connector.
While back probing, measure the voltage of the Rear Intrusion Sensor Signal circuit
at the Thatchem Alarm Module 16-way connector.
Turn the ignition on while observing the voltmeter.
NOTE: Voltage will only be present during the first 6 seconds when the
ignition is turned on.
Is the voltage above 10.0 volts when the ignition is initially turned on?

All

Yes

→ Repair the Rear Intrusion Sensor Signal circuit for an open.

Perform VTSS VERIFICATION TEST - 1A.

No

→ Replace the RKE/Thatcham Alarm Module.

Perform VTSS VERIFICATION TEST - 1A.

11

Gain access to the RKE/Thatcham Alarm Module.
Disconnect the Thatcham Alarm Module 16-way connector.
Measure the resistance of the Sensor Ground circuit between the Thatcham Alarm
Module connector and the Front Intrusion Sensor connector.
Is the resistance below 5.0 ohms?

All

Yes

→ Replace the RKE/Thatcham Alarm Module.

Perform VTSS VERIFICATION TEST - 1A.

No

→ Repair the Front Sensor Ground circuit for an open.

Perform VTSS VERIFICATION TEST - 1A.

952

VEHICLE THEFT/SECURITY

INTERNAL ULTRASONIC FAULT (EXPORT ONLY) —

Continued

TEST

ACTION

APPLICABILITY

12

Turn the ignition off.
Gain access to the RKE/Thatcham Alarm Module 16-way connector.
While back probing, measure the voltage of the Front Intrusion Sensor Signal circuit
at the Thatcham Alarm Module 16-way connector.
Turn the ignition on while observing the voltmeter.
NOTE: Voltage will only be present during the first 6 seconds when the
ignition is turned on.
Is the voltage above 10.0 volts when the ignition is initially turned on?

All

Yes

→ Repair the Front Intrusion Sensor Signal circuit for an open.

Perform VTSS VERIFICATION TEST - 1A.

No

→ Replace the RKE/Thatcham Alarm Module.

Perform VTSS VERIFICATION TEST - 1A.

953

VEHICLE THEFT/SECURITY

INTERNAL ULTRASONIC FAULT (EXPORT ONLY) —

Continued

Symptom:

LOOPBACK ERROR (EXPORT ONLY)

When Monitored and Set Condition:

LOOPBACK ERROR (EXPORT ONLY)

When Monitored:

During power up, following detection of any other Bus errors.

Set Condition:

Internally transmitted message on the PCI Bus is not received correctly.

POSSIBLE CAUSES

INTERMITTENT CONDITION

RKE/THATCHAM ALARM MODULE - INTERNAL MALFUNCTION

TEST

ACTION

APPLICABILITY

1

Turn the ignition on.
With the DRBIII

t, erase the current RKE/Thatcham Alarm Module DTC’s.

Turn the ignition off, wait 10 seconds then turn the ignition on.
With the DRBIII

t, read the current RKE/Thatcham Alarm Module DTC’s.

Does the DRBIII

t display: LOOPBACK ERROR?

All

Yes

→ Replace the RKE/Thatcham Alarm Module.

Perform VTSS VERIFICATION TEST - 1A.

No

→ The condition that caused this symptom is currently not present.

Perform VTSS VERIFICATION TEST - 1A.

954

VEHICLE THEFT/SECURITY

Symptom:

NO VALID MESSAGES RECEIVED (EXPORT ONLY)

When Monitored and Set Condition:

NO VALID MESSAGES RECEIVED (EXPORT ONLY)

When Monitored:

Continuously with the ignition on.

Set Condition:

The RKE/Thatcham Alarm Module does not receive any valid messages on

the PCI Bus for a minimum of 5 seconds.

POSSIBLE CAUSES

INTERMITTENT CONDITION

RKE/THATCHAM ALARM MODULE - INTERNAL MALFUNCTION

TEST

ACTION

APPLICABILITY

1

Turn the ignition on.
With the DRBIII

t, erase the current RKE/Thatcham Alarm Module DTC’s.

Turn the ignition off, wait 10 seconds then turn the ignition on.
With the DRBIII

t, read the current RKE/Thatcham Alarm Module DTC’s.

Does the DRBIII

t display: NO VALID MESSAGES RECEIVED?

All

Yes

→ Replace the RKE/Thatcham Alarm Module.

Perform VTSS VERIFICATION TEST - 1A.

No

→ The condition that caused this symptom is currently not present.

Inspect the related wiring harness for a possible intermittent
condition.
Perform VTSS VERIFICATION TEST - 1A.

955

VEHICLE THEFT/SECURITY