Dodge Dakota (ND). Manual — part 442
U0170-LOST COMMUNICATION W/UP-FRONT LEFT SATELLITE ACCELERATION
SENSOR
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RESTRAINTS - ELECTRICAL DIAGNOSTICS
ND
U0170-LOST COMMUNICATION W/UP-FRONT LEFT SATELLITE ACCELERATION SENSOR (CONTINUED)
For the Airbag System circuit diagram (Refer to 8 - ELECTRICAL/RESTRAINTS - SCHEMATICS AND DIAGRAMS).
For a complete wiring diagram Refer to Section 8W.
•
When Monitored:
The Occupant Restraint Controller (ORC) continuously communicates with the Front Left Impact Sensor over
the sensor signal circuit. The sensor communication and on board diagnostics are powered by the ORC signal.
•
Set Condition:
This code will set, if the ORC and the Front Left Impact Sensor do not establish and maintain valid data com-
munications.
Possible Causes
(R79) SIGNAL CIRCUIT SHORTED TO BATTERY
(R79) SIGNAL CIRCUIT SHORTED TO GROUND
(R79, R81) FRONT LEFT IMPACT SENSOR CIRCUITS SHORTED TOGETHER
(R81) FRONT LEFT IMPACT SENSOR GROUND CIRCUIT OPEN
(R79) FRONT LEFT IMPACT SENSOR SIGNAL CIRCUIT OPEN
ORC, FRONT LEFT IMPACT SENSOR
Diagnostic Test
1.
VERIFY THAT DTC U0170-LOST COMMUNICATION W/UP-FRONT LEFT SATELLITE ACCELERATION
SENSOR IS ACTIVE
NOTE: Ensure the battery is fully charged.
NOTE: When reconnecting Airbag system components, the ignition must be turned off and the battery must
be disconnected.
Turn the ignition on.
With the scan tool, read ORC DTCs.
Does the scan tool display active:U0170-LOST COMMUNICATION W/UP-FRONT LEFT SATELLITE ACCEL-
ERATION SENSOR?
Yes
>> Go To 2
No
>> Go To 9
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RESTRAINTS - ELECTRICAL DIAGNOSTICS
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U0170-LOST COMMUNICATION W/UP-FRONT LEFT SATELLITE ACCELERATION SENSOR (CONTINUED)
2.
CHECK THE (R79, R81) FRONT LEFT IMPACT SENSOR SIGNAL AND GROUND CIRCUITS FOR A SHORT
TO BATTERY
WARNING: To avoid personal injury or death, turn the ignition off,
disconnect the battery and wait two minutes before proceeding.
Disconnect the Front Left Impact Sensor connector.
Disconnect the ORC connector.
WARNING: To avoid personal injury or death, turn the ignition on,
then reconnect the battery.
Measure the voltage of the (R79) Front Left Impact Sensor Signal cir-
cuit and (R81) Sensor Ground circuit at the Front Left Impact Sensor
connector and ground.
Is there any voltage present?
Yes
>> Repair the (R79, R81) Front Left Impact Sensor circuits for
a short to battery.
Perform the ORC VERIFICATION TEST - VER 1.
No
>> Go To 3
3.
CHECK THE (R79) FRONT LEFT IMPACT SENSOR SIGNAL CIRCUIT FOR A SHORT TO GROUND
WARNING: To avoid personal injury or death, turn the ignition off,
disconnect the battery and wait two minutes before proceeding.
Measure the resistance of the (R79) Front Left Impact Sensor Signal
circuit between the Front Left Impact Sensor connector and ground.
Is the resistance below 100K ohms?
Yes
>> Repair the (R79) Front Left Impact Sensor Signal circuit
for a short to ground.
Perform the ORC VERIFICATION TEST - VER 1.
No
>> Go To 4
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RESTRAINTS - ELECTRICAL DIAGNOSTICS
ND
U0170-LOST COMMUNICATION W/UP-FRONT LEFT SATELLITE ACCELERATION SENSOR (CONTINUED)
4.
CHECK THE (R79, R81) FRONT LEFT IMPACT SENSOR CIRCUITS FOR A SHORT TOGETHER
Measure the resistance between the (R79) Front Left Impact Sensor
Signal and (R81) Sensor Ground circuits at the Front Left Impact Sen-
sor connector.
Is the resistance below 100K ohms?
Yes
>> Repair the (R79, R81) Front Left Impact Sensor circuits
shorted together.
Perform the ORC VERIFICATION TEST - VER 1.
No
>> Go To 5
5.
CHECK THE (R81) FRONT LEFT IMPACT SENSOR GROUND CIRCUIT FOR AN OPEN OR HIGH
RESISTANCE
Connect the 8443 Load Tool ORC Adaptor to the Occupant Restraint
Control Module connector.
Measure the resistance of the (R81) Front Left Impact Sensor Ground
circuit between the Front Left Impact Sensor connector and the 8443
Load Tool ORC Adaptor.
Is the resistance below 1 ohm?
Yes
>> Go To 6
No
>> Repair the (R81) Front Left Impact Sensor 1 Ground cir-
cuit for an open or high resistance.
Perform the ORC VERIFICATION TEST - VER 1.
ND
RESTRAINTS - ELECTRICAL DIAGNOSTICS
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