Chrysler Town, Dodge Caravan. Manual — part 859

Symptom:

EEPROM REFRESH FAILURE

When Monitored and Set Condition:

EEPROM REFRESH FAILURE

When Monitored:

With the ignition in the on position.

Set Condition:

The Memory Seat Mirror Module has a internal EEPROM failure.

POSSIBLE CAUSES

EEPROM REFRESH FAILURE

TEST

ACTION

APPLICABILITY

1

If there are no possible causes remaining, view repair.

All

Repair

Replace the Memory Seat Mirror Module.
Perform MEMORY SYSTEM VERIFICATION TEST - VER 1.

672

MEMORY SEAT

Symptom:

FRONT RISER DOWN POSITION STUCK

When Monitored and Set Condition:

FRONT RISER DOWN POSITION STUCK

When Monitored:

Continuously when the PCI bus is active.

Set Condition:

If the seat switch is active for 30 seconds, this code will set and the

Memory Seat Mirror Module will ignore the input until the state has changed. Three
seconds after the stuck condition is removed, the seat will resume to normal operation.
Code will remain for 50 ignition cycles.

POSSIBLE CAUSES

STORED DIAGNOSTIC TROUBLE CODE

POWER SEAT SWITCH

SEAT FRONT DOWN SWITCH SENSE WIRE SHORT TO VOLTAGE

MEMORY SEAT MIRROR MODULE

TEST

ACTION

APPLICABILITY

1

With the DRBIII

t, erase the DTC from Memory Seat Mirror Module.

Operate the driver’s power seat and memory system.
Turn the ignition switch to the Off position then start the engine and let run for one
minute.
With the DRB check for the same DTC to reset in the MSMM.
Did the same DTC reset?

All

Yes

→ Go To 2

No

→ Using the wiring diagram/schematic as a guide, inspect the

wiring and connectors for an intermittent condition.
Perform MEMORY SYSTEM VERIFICATION TEST - VER 1.

2

Disconnect the Power Seat Switch connector.
Measure the voltage of the Seat Front Down Switch Sense circuit.
Is there any voltage present?

All

Yes

→ Go To 3

No

→ Replace the Power Seat Switch.

Perform MEMORY SYSTEM VERIFICATION TEST - VER 1.

3

Disconnect the Power Seat Switch connector.
Disconnect the Memory Seat Mirror Module C1 connector.
Turn the ignition on.
Measure the voltage of the Seat Front Down Switch Sense circuit to ground..
Is there any voltage present?

All

Yes

→ Repair the Seat Front Down Switch Sense wire for a short to

voltage.
Perform MEMORY SYSTEM VERIFICATION TEST - VER 1.

No

→ Go To 4

673

MEMORY SEAT

TEST

ACTION

APPLICABILITY

4

If there are no possible causes remaining, view repair.

All

Repair

Replace the Memory Seat Mirror Module.
Perform MEMORY SYSTEM VERIFICATION TEST - VER 1.

674

MEMORY SEAT

FRONT RISER DOWN POSITION STUCK —

Continued

Symptom:

FRONT RISER SENSOR OUT OF RANGE HIGH

When Monitored and Set Condition:

FRONT RISER SENSOR OUT OF RANGE HIGH

When Monitored:

Continuously when the PCI bus is active.

Set Condition:

This condition is immediately set when the seat motor potentiometer

feeds a value higher than the Memory Seat Mirror Module has stored in EEPROM. Code
will remain for 50 ignition cycles.

POSSIBLE CAUSES

MEMORY SEAT MIRROR MODULE SENSOR GROUND OPEN

SEAT POSITION SENSOR GROUND WIRE OPEN

5 VOLT SUPPLY SHORTED HIGH

CHECK VOLTAGE ON FRONT RISER POSITION SIGNAL CIRCUIT

FRONT RISER SENSOR HIGH

FRONT RISER SENSOR SHORT TO MOTOR

MEMORY SEAT MIRROR MODULE FRONT RISER HIGH

STORED DIAGNOSTIC TROUBLE CODE

TEST

ACTION

APPLICABILITY

1

With the DRBIII

t, erase the DTC from Memory Seat Mirror Module.

Operate the driver’s power seat and memory system.
Turn the ignition switch to the Off position then start the engine and let run for one
minute.
With the DRB check for the same DTC to reset in the MSMM.
Did the same DTC reset?

All

Yes

→ Go To 2

No

→ Using the wiring diagram/schematic as a guide, inspect the

wiring and connectors for an intermittent condition.
Perform MEMORY SYSTEM VERIFICATION TEST - VER 1.

2

Turn ignition off.
Disconnect the Driver Power Seat Front Riser Position Sensor connector.
Measure the resistance of the Seat Position Sensor Ground circuit at the Driver
Power Seat Front Riser Position Sensor connector.
Is the resistance below 5.0 ohms?

All

Yes

→ Go To 3

No

→ Go To 8

675

MEMORY SEAT