Dodge Dakota (ND). Manual — part 217
*NO RESPONSE FROM HFM (HANDS FREE MODULE) (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
Possible Causes
(A918) FUSED B(+) CIRCUIT OPEN OR SHORTED
(Z939) GROUND CIRCUIT OPEN
(D55) AND (D54) CAN B BUS CIRCUITS OPEN
HANDS FREE MODULE
Diagnostic Test
1.
TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
With the scan tool, select ECU view.
NOTE: A red X will be next to the module that is not communicating, indicating that the module is not active
on the Bus network. A green check indicates that the module is active on the Bus network.
Does the scan tool display a red X next to the module?
Yes
>> Go To 2
No
>> The no response condition is not present at this time. Using the wiring diagram/schematic as a guide,
inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness con-
nectors for broken, bent , pushed out, and corroded terminals.
2.
(A918) FUSED B(+) CIRCUIT OPEN OR SHORTED
Turn the ignition off.
Disconnect the Hands Free Module harness connector.
Using a 12-volt test light connected to ground, check the (A918) Fused
B(+) circuit.
Does the test light illuminate brightly?
Yes
>> Go To 3
No
>> Repair the (A918) Fused B(+) circuit for an open or short.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1).
8E - 124
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
ND
*NO RESPONSE FROM HFM (HANDS FREE MODULE) (CONTINUED)
3.
(Z939) GROUND CIRCUIT OPEN
Using a 12-volt test light connected to 12-volts, check the (Z939)
ground circuit.
Does the test light illuminate brightly?
Yes
>> Go To 4
No
>> Repair the (Z939) ground circuit for an open.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1).
4.
(D55) AND (D54) CAN B BUS CIRCUITS OPEN
NOTE: One open circuit will not cause this condition.
Measure the voltage between the (D54) CAN B Bus (-) circuit and
ground.
Measure the voltage between the (D55) CAN B Bus (+) circuit and
ground.
Is there any voltage present on either circuit?
Yes
>> Replace the Hands Free Module in accordance with the
service information.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1).
No
>> Repair the (D55) and (D54) CAN B Bus circuits for an
open. Inspect the connector for damage.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1).
ND
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
8E - 125
*NO RESPONSE FROM HVAC (A/C HEATER CONTROL)
8E - 126
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
ND
*NO RESPONSE FROM HVAC (A/C HEATER CONTROL) (CONTINUED)
For a complete wiring diagram Refer to Section 8W.
Possible Causes
(F504) FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN OR SHORTED
(Z24) GROUND CIRCUIT OPEN
(D55) AND (D54) CAN B BUS CIRCUITS OPEN
A/C HEATER CONTROL
Diagnostic Test
1.
TEST FOR INTERMITTENT CONDITION
Turn the ignition on.
NOTE: Ensure the IOD fuse is installed and battery voltage is between 10.0 and 16.0 volts.
With the scan tool, select ECU view.
NOTE: A red X will be next to the module that is not communicating, indicating that the module is not active
on the Bus network. A green check indicates that the module is active on the Bus network.
Does the scan tool display a red X next to the module?
Yes
>> Go To 2
No
>> The no response condition is not present at this time. Using the wiring diagram/schematic as a guide,
inspect the wiring for chafed, pierced, pinched, and partially broken wires and the wiring harness con-
nectors for broken, bent , pushed out, and corroded terminals.
2.
(F504) FUSED IGNITION SWITCH OUTPUT CIRCUIT OPEN OR SHORTED
Turn the ignition off.
Disconnect the A/C Heater Control C1 harness connector.
Turn the ignition on.
Using a 12-volt test light connected to ground, check the (F504) Fused
Ignition Switch Output circuit.
Does the test light illuminate brightly?
Yes
>> Go To 3
No
>> Repair the (F504) Fused Ignition Switch Output circuit for
an open or short.
Perform BODY VERIFICATION TEST - VER 1. (Refer to
BODY VERIFICATION TEST - VER 1).
ND
ELECTRONIC CONTROL MODULES - ELECTRICAL DIAGNOSTICS
8E - 127
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