Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1449
B10B7 - CABIN HEATER 2 CONTROL CIRCUIT
For a complete wiring diagram Refer to Section 8W
9 - 1820
ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
LX
•
When Monitored:
With the ignition on.
•
Set Condition:
A Cabin Heater (PTC) #2 error message has been received over the CAN bus from the Front Control Module.
Possible Causes
INTERMITTENT DTC
DTC SET IN FRONT CONTROL MODULE (FCM)
ENGINE CONTROL MODULE (ECM)
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
DTC IS ACTIVE
NOTE: This DTC will set if the Engine Control Module (ECM) receives a message from the Front Control
Module indicating that a PTC Heater Relay DTC is present.
Ignition on, engine not running.
With the scan tool, Clear DTCs in the Engine Control Module (ECM).
With the scan tool, actuate the PTC Heater Relay 2.
With the scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
>> Go To 2
No
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
2.
ENGINE CONTROL MODULE (ECM)
With the scan tool, select View DTCs in the Front Control Module.
Is there a stored or active PTC Heater Relay DTC present in the Front Control Module?
Yes
>> Refer to 24 - HVAC — ELECTRICAL DIAGNOSTICS for diagnostic procedures and for further possible
causes.
No
>> Replace the Engine Control Module (ECM) in accordance with the Service Information.
Perform the ECM Verification Test Ver. 1. (Refer to 9 - ENGINE - DIAGNOSIS AND TESTING)
LX
ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1821
B1138 - CABIN HEATER 3 CONTROL CIRCUIT LOW
For a complete wiring diagram Refer to Section 8W
9 - 1822
ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
LX
•
When Monitored:
With the ignition on and the PTC No. 3 Relay command off.
•
Set Condition:
The ECM detects a short to ground on the (K363) PTC No. 3 Relay Control circuit for 1.0 second.
Possible Causes
INTERMITTENT DTC
(K342) FUSED ASD RELAY OUTPUT CIRCUIT 1 OPEN OR HIGH RESISTANCE
(K363) PTC NO. 3 RELAY CONTROL CIRCUIT SHORTED TO GROUND
(K363) PTC NO. 3 RELAY CONTROL CIRCUIT OPEN OR HIGH RESISTANCE
PTC NO. 3 RELAY
ENGINE CONTROL MODULE (ECM)
Always perform the Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
Diagnostic Test
1.
DTC IS ACTIVE
Ignition on, engine not running.
With the scan tool, Clear DTCs in the Engine Control Module (ECM).
With the scan tool, actuate the PTC No. 3 Relay.
With the scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
>> Go To 2
No
>> Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. (Refer to 9 - ENGINE -
DIAGNOSIS AND TESTING)
2.
(K342) FUSED ASD RELAY OUTPUT 1 CIRCUIT OPEN OR HIGH RESISTANCE
Turn the ignition off.
Remove the PTC No. 3 Relay.
Turn the ignition on.
Using a 12 volt test light connected to ground, check the (K342) Fused
ASD Relay Output 1 circuit in the PTC No. 3 Relay connector.
NOTE: The test light should be illuminated and bright. Compare
the brightness to that of a direct connection to the battery.
Is the test light illuminated and bright?
Yes
>> Go to 3
No
>> Repair the (K342) Fused ASD Relay Output 1 circuit for an
open circuit or high resistance.
Perform the ECM Verification Test Ver. 1. (Refer to 9 -
ENGINE - DIAGNOSIS AND TESTING)
LX
ENGINE ELECTRICAL DIAGNOSTICS - DIESEL
9 - 1823
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