Chrysler 300/300 Touring/300C, Dodge Magnum. Manual — part 1929
Theory of Operation
The brake switch signal must be active before the shift lever can be moved out of the park position. The Electronic
Shift Module (ESM) receives two brake switch signals. The first signal is a CAN C BUS message is from the ABS
and the second signal is a hard wired brake switch signal to the ESM. The CAN C Bus message is the primary
brake switch signal and the hard wired signal serves as the backup brake switch signal.
•
When Monitored:
Continuously with the ignition on.
•
Set Condition:
The DTC will set if the high side driver detects a short to ground for 10 seconds.
Possible Causes
ENGINE BRAKE DTCS PRESENT
ABS DTCS PRESENT
(B29) BRAKE SWITCH SIGNAL SHORT TO GROUND
ELECTRONIC SHIFT MODULE (ESM)
Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 -
TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
Diagnostic Test
1.
ENGINE DTCS PRESENT
With the scan tool, read Engine DTCs.
Are there any Engine brake DTCs present?
Yes
>> Refer to Engine category and perform the appropriate symptom(s). (Refer to 9 - ENGINE - DIAGNOSIS
AND TESTING)
Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - NAG1 - STANDARD PROCEDURE)
No
>> Go To 2
2.
ABS MODULE DTCS PRESENT
With the scan tool, read ABS Module DTCs.
Are there any ABS DTCs present?
Yes
>> Refer to the Brake category and perform the appropriate symptom(s). (Refer to 5 - BRAKES - DIAG-
NOSIS AND TESTING)
Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - NAG1 - STANDARD PROCEDURE)
No
>> Go To 3
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AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
LX
3.
(B29) BRAKE SWITCH SIGNAL SHORT TO GROUND
Turn the ignition off to the lock position.
Disconnect the ESM harness connector.
Measure the resistance between ground and the (B29) Brake Switch
Signal circuit.
Is the resistance below 5.0 ohms?
Yes
>> Repair the (B29) Brake Switch Signal for a short to ground.
Perform NAG1 TRANSMISSION VERIFICATION TEST.
(Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC -
NAG1 - STANDARD PROCEDURE)
No
>> Using the schematics as a guide, check the Electronic Shift
Module (ESM) terminals for corrosion, damage, or terminal
push out. Pay particular attention to all power and ground
circuits. If no problems are found, replace the ESM (Steer-
ing Column) per the Service Information.
Perform NAG1 TRANSMISSION VERIFICATION TEST.
(Refer to 21 - TRANSMISSION/TRANSAXLE/AUTOMATIC -
NAG1 - STANDARD PROCEDURE)
LX
AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
21 - 251
P0931-BTSI CONTROL CIRCUIT HIGH - ESM (COLUMN SHIFT)
For a complete wiring diagramRefer to Section 8W
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AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
LX
Theory of Operation
The brake switch signal must be active before the shift lever can be moved out of the park position. The Electronic
Shift Module (ESM) receives two brake switch signals. The first signal is a CAN C BUS message and the second
signal is a hard wired brake switch signal to the shifter lever assembly. The CAN C Bus message is the primary
brake switch signal and the hard wired signal serves as the backup brake switch signal. These two brake switch
signals are compared against each other to verify proper brake switch operation.
•
When Monitored:
Continuously with the ignition key on.
•
Set Condition:
The DTC will set if the high side driver detects an open load for 10 seconds.
Possible Causes
ENGINE BRAKE DTC’S PRESENT
ABS DTC’S PRESENT
(B29) BRAKE SWITCH SIGNAL OPEN
(B29) BRAKE SWITCH SIGNAL SHORT TO VOLTAGE
ELECTRONIC SHIFT MODULE (ESM)
Always perform the NAG1 Pre-Diagnostic Troubleshooting procedure before proceeding. (Refer to 21 -
TRANSMISSION/TRANSAXLE/AUTOMATIC - NAG1 - STANDARD PROCEDURE)
Diagnostic Test
1.
ENGINE DTCs PRESENT
With the scan tool, read Engine DTCs.
Are there any Engine brake DTCs present?
Yes
>> Refer to Engine category and perform the appropriate symptom(s). (Refer to 9 - ENGINE - DIAGNOSIS
AND TESTING)
Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - NAG1 - STANDARD PROCEDURE)
No
>> Go To 2
2.
ABS MODULE DTCs PRESENT
With the scan tool, read ABS Module DTCs.
Are there any ABS DTCs present?
Yes
>> Refer to the Brake category and perform the appropriate symptom(s). (Refer to 5 - BRAKES - DIAG-
NOSIS AND TESTING)
Perform NAG1 TRANSMISSION VERIFICATION TEST. (Refer to 21 - TRANSMISSION/TRANSAXLE/
AUTOMATIC - NAG1 - STANDARD PROCEDURE)
No
>> Go To 3
LX
AUTOMATIC TRANSMISSION NAG1 - SHIFTER DIAGNOSTICS
21 - 253
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