Chrysler Pacifica. Manual - part 188

TEST

ACTION

APPLICABILITY

NOTE: Ensure there is communication with the Body Control Module,
Instrument Cluster and other modules before proceeding.
NOTE: For this code to be active, the DRBIII

t will not be able to communi-

cate with any modules on the vehicle, except the PCM.
With the DRBIII

t, erase DTCs.

Cycle the ignition switch from on to off and then back to on..
With the DRBIII

t, read DTCs.

Does the DRBIII

t display PCI BUS SHORTED TO GROUND?

All

→ The condition is not present at this time. Monitor DRBIIIt

parameters while wiggling the related wire harness. Refer to any
Technical Service bulletins (TSB) that may apply. Visually inspect
the related wiring harness and connector terminals.
Perform BODY VERIFICATION TEST - VER 1.

Yes

→ Replace the Navigation Unit in accordance with the Service

Information.
Perform BODY VERIFICATION TEST - VER 1.

749

NAVIGATION

NO PCI BUS TRANSMISSION —

Continued

Symptom:

PCM MESSAGES NOT RECEIVED

When Monitored and Set Condition:

PCM MESSAGES NOT RECEIVED

When Monitored:

When the Navigation Unit is powered up.

Set Condition:

If the Vehicle Speed message is not received, the NAV system will have the

vehicle icon remain stationary. If no vehicle speed message is received for 2 seconds and the
vehicle is in Drive, full programming will be disabled.

POSSIBLE CAUSES

DTC INTERMITTENT CONDITION

PCM DTC PRESENT

NAVIGATION UNIT

TEST

ACTION

APPLICABILITY

With the DRBIII

t, erase DTCs.

Cycle the ignition switch from on to off and then back to on..
Turn the Navigation System on and try to select a location.
With the DRBIII

t, read DTCs.

Does the DRBIII

t display PCM MESSAGES NOT RECEIVED?

All

→ The condition is not present at this time. Monitor DRBIIIt

Yes

→ Go To 2

NOTE: Diagnose and repair any PCM DTCs present before proceeding with
this test.
Turn the ignition on.
With the DRBIII

t monitor the Vehicle Speed while moving the vehicle.

Does the DRBIII

t display Vehicle Speed correctly?

All

Yes

→ With the DRBIIIt, erase DTCs. Turn the ignition off, wait 10

seconds, then turn the ignition on. With the DRBIII

t, read DTCs.

If this code resets, replace the Navigation Unit in accordance with
the Service Information.
Perform BODY VERIFICATION TEST - VER 1.

→ Refer to DRIVEABILITY for the related symptom(s).

Perform BODY VERIFICATION TEST - VER 1.

750

NAVIGATION

Symptom:

TCM MESSAGES NOT RECEIVED

When Monitored and Set Condition:

TCM MESSAGES NOT RECEIVED

When Monitored:

At all times.

Set Condition:

If no PCI Reverse message is received for 5 consecutive messages, the NAV

system will assume forward motion and be reflected with movement of the vehicle icon.

POSSIBLE CAUSES

DTC INTERMITTENT CONDITION

PARK/NEUTRAL SWITCH FAULT OR TCM DTC PRESENT

NAVIGATION UNIT

TEST

ACTION

APPLICABILITY

With the DRBIII

t, erase DTCs.

Cycle the ignition switch from on to off and then back to on..
Turn the Navigation System on and try to select a location.
With the DRBIII

t, read DTCs.

Does the DRBIII

t display TCM MESSAGES NOT RECEIVED?

All

→ The condition is not present at this time. Monitor DRBIIIt

Yes

→ Go To 2

NOTE: Diagnose and repair any TCM DTCs before proceeding with this test.
Turn the ignition on, engine not running.
With the DRBIII

t, monitor the Park/Neutral Position Switch input state.

Move the gear selector through all gear positions.
Does the DRBIII

t display Park/Neutral and Drive/Reverse in the correct gear

positions?

All

Yes

→ Replace the Navigation Unit in accordance with the Service

Information.
Perform BODY VERIFICATION TEST - VER 1.

→ Refer to symptom 9*CHECKING PARK/NEUTRAL SWITCH OP-

ERATION in the TRANSMISSION - NGC category.
Perform BODY VERIFICATION TEST - VER 1.

751

NAVIGATION

Symptom:

BCM MESSAGES NOT RECEIVED

When Monitored and Set Condition:

BCM MESSAGES NOT RECEIVED

When Monitored:

With the ignition on.

Set Condition:

This DTC will set if the OHC does not receive PCI bus messages from the

BCM for 5 seconds. The OHC receives raw fuel and distance data from the BCM to compute
the fuel and distance values displayed by the EVIC.

POSSIBLE CAUSES

COMM FAULT PRESENT

OVERHEAD CONSOLE

TEST

ACTION

APPLICABILITY

With the DRBIII

t, attempt to communicate with the BCM.

Was the DRBIII

t able to communicate with the BCM?

All

Yes

→ With the DRBIIIt, erase DTCs. Turn the ignition off, wait 10

seconds, then turn the ignition on. With the DRBIII

t, read DTCs.

If this code resets, replace the Overhead Console in accordance
with the Service Information.
Perform BODY VERIFICATION TEST - VER 1.

→ Refer to COMMUNICATION for the related symptom(s).

Perform BODY VERIFICATION TEST - VER 1.

752

OVERHEAD CONSOLE

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