Chrysler Voyager. Manual — part 246

Symptom:

*NO RESPONSE FROM THATCHAM ALARM MODULE

POSSIBLE CAUSES

ATTEMPT TO COMMUNICATE WITH THE BCM

GROUND CIRCUIT OPEN

FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN

OPEN PCI BUS CIRCUIT

THATCHAM ALARM MODULE

TEST

ACTION

APPLICABILITY

1

Turn the ignition on.
With the DRB, enter Body then Body Computer.
Was the DRB able to I/D or communicate with the BCM?

All

Yes

→ Go To 2

No

→ Refer to the symptom list for problems related to no communica-

tion with the BCM.
Perform BODY VERIFICATION TEST - VER 1.

2

Turn the ignition off.
Disconnect the RKE Module 6-way harness connector.
Using a 12-volt test light connected to 12-volts, probe the ground circuit.
Is the test light illuminated?

All

Yes

→ Go To 3

No

→ Repair the Ground circuit for an open.

Perform BODY VERIFICATION TEST - VER 1.

3

Turn the ignition off.
Disconnect the Thatcham Alarm Module C1 harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, probe the Fused Ignition Switch
Output circuit.
Is the test light illuminated?

All

Yes

→ Go To 4

No

→ Repair the Fused Ignition Switch Output circuit for an open or

short.
Perform BODY VERIFICATION TEST - VER 1.

411

COMMUNICATION

TEST

ACTION

APPLICABILITY

4

Note: Ensure there is PCI Bus communication with other modules on the
vehicle before proceeding. If not, refer to the symptom list from the menu
and repair as necessary.
Disconnect the Thatcham Alarm Module C1 harness connector.
Use Scope input cable CH7058, Cable to Probe adapter CH7062, and the red and
black test probes.
Connect the scope input cable to the channel one connector on the DRB. Attach the
red and black leads and the cable to probe adapter to the scope input cable.
With the DRBIII

t select Pep Module Tools.

Select lab scope.
Select Live Data.
Select 12 volt square wave.
Press F2 for Scope.
Press F2 and use the down arrow to set voltage range to 20 volts. Set Probe to x10.
Press F2 again when complete.
Connect the Black lead to the chassis ground. Connect the Red lead to the PCI Bus
circuit in the Thatcham Alarm Module connector.
Turn the ignition on.
Observe the voltage display on the DRB Lab Scope.
Does the voltage pulse from 0 to approximately 7.5 volts?

All

Yes

→ Go To 5

No

→ Repair the PCI Bus circuit for an open.

Perform BODY VERIFICATION TEST - VER 1.

5

If there are no possible causes remaining, view repair.

All

Repair

Replace the Thatcham Alarm Module in accordance with the
service information.
Perform BODY VERIFICATION TEST - VER 1.

412

COMMUNICATION

*NO RESPONSE FROM THATCHAM ALARM MODULE —

Continued

Symptom:

*NO RESPONSE FROM TRANSMISSION CONTROL MODULE -
EATX

POSSIBLE CAUSES

NO RESPONSE FROM TRANSMISSION CONTROL MODULE

FCM OUTPUT (RUN/ST) CIRCUIT OPEN

FUSED IGNITION SWITCH OUTPUT (START) CIRCUIT OPEN

FUSED IGNITION SWITCH OUTPUT (START) CIRCUIT SHORT

FUSED B(+) CIRCUIT OPEN

GROUND CIRCUIT(S) OPEN

OPEN PCI BUS CIRCUIT

TRANSMISSION CONTROL MODULE

TEST

ACTION

APPLICABILITY

1

Ignition on, engine not running.
Note: As soon as one or more module communicates with the DRB, answer
the question.
With the DRB, attempt to communicate with the Airbag Control Module (ACM).
With the DRB, attempt to communicate with the Body Control Module (BCM).
Was the DRB able to I/D or establish communications with either of the modules?

All

Yes

→ Go To 2

No

→ Refer to the Body Communication category and perform the

symptom PCI Bus Communication Failure.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.

2

Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Ignition on, engine not running.
Using a 12-volt test light connected to ground, probe the FCM Output (Run/St)
circuit.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?

All

Yes

→ Go To 3

No

→ Repair the FCM Output (Run/St) circuit for an open. Refer to the

wiring diagrams location in the Service Information.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.

413

COMMUNICATION

TEST

ACTION

APPLICABILITY

3

Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Remove the starter relay from the IPM.
Using a 12-volt test light connected to ground, probe the Fused Ignition Switch
Output (Start) circuit.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Observe the test light while momentarily turning the ignition switch to the Start
position.
Does the test light illuminate brightly?

All

Yes

→ Go To 4

No

→ Repair the Fused Ignition Switch Output (Start) circuit for an

open. Refer to the wiring diagrams located in the Service Infor-
mation.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.

Note: Reinstall the original Starter Relay.

4

Turn the ignition off to the lock position.
Disconnect the TCM harness connector.
Remove the starter relay from the IPM.
With a voltmeter in the millivolt scale, measure the voltage of the Fused Ignition
Switch Output (Start) circuit.
NOTE: A no response condition can exist if voltage is present on this circuit
with the ignition switch in any position except for the Start position.
NOTE: Voltage up to .080 millivolts can cause this condition.
NOTE: Check for after market components that could cause this condition.
Perform this step with the Ignition Switch in every position except for the Start
position.
Is any voltage present?

All

Yes

→ Repair the Fused Ignition Switch Output (Start) circuit for a

short to voltage. Refer to the wiring diagrams located in the
Service Information.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.

No

→ Go To 5

Note: Reinstall the original Starter Relay.

5

Turn the ignition off.
Disconnect the TCM harness connector.
Using a 12-volt test light connected to ground, check the Fused B(+) circuit.
NOTE: The test light must illuminate brightly. Compare the brightness to
that of a direct connection to the battery.
Does the test light illuminate brightly?

All

Yes

→ Go To 6

No

→ Repair the Fused B(+) circuit for an open. Refer to the wiring

diagrams located in the Service Information.
Perform 41TE TRANSMISSION VERIFICATION TEST - VER 1.

414

COMMUNICATION

*NO RESPONSE FROM TRANSMISSION CONTROL MODULE - EATX —

Continued