Diagnostic Test

WARNING: This page is about a different car, the 2013 RAM 3500 HD and 2013 RAM 2500 HD. However, it is still accessible from the selected car via links, so may be relevant.

TEST FOR INTERMITTENT CONDITION
NOTE:
Verify that the vehicle's battery is fully charged with a DVOM and use the scan tool to compare the Battery Voltage listed under "Data" in the RFH View to that of the BCM. If the vehicle's battery is not fully charged, correct this condition before proceeding.

NOTE:
If another antenna has a Short to Ground, General Electrical Failure or Open DTC, both antennas will set this Short to Voltage DTC.
1. Turn the ignition on.
2. Using the scan tool, record and erase the DTCs.
3. With the scan tool, select: RF Hub, More Options and System Tests.
4. Perform the RF Hub LF Antenna Verification Tests.
5. With the scan tool, read the Active DTCs.
  Does the scan tool display: B1A71-12-PASSIVE ENTRY ANTENNA 1 - CIRCUIT SHORT TO BATTERY as active?
  
  Yes
  - Go To 2
  No
  - Test complete, the condition or conditions that originally set this DTC are not present at this time. Using the wiring diagrams as a guide, check all related splices and connectors for signs of water intrusion, corrosion, pushed out or bent terminals and correct pin tension.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(D920) PASSIVE ENTRY ANTENNA 1 SIGNAL CIRCUIT SHORTED TO VOLTAGE

Fig 1: Measuring Voltage Between Ground & Passive Entry Antenna 1 Signal Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the Radio Frequency Hub C2 harness connector.
3. Turn the ignition on.
4. Measure the voltage between ground and the (D920) Passive Entry Antenna 1 Signal circuit.
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (D920) Passive Entry Antenna 1 Signal circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 3
(D921) PASSIVE ENTRY ANTENNA 1 RETURN CIRCUIT SHORT TO VOLTAGE
1. Be sure the ignition is still on.
2. Measure the voltage between ground and the (D921) Passive Entry Antenna 1 Return circuit (Cavity 15 in the C2 connector).
  Is there any voltage present?
  
  Yes
  - Repair the short to voltage in the (D921) Passive Entry Antenna 1 Return circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace the RF HUB in accordance with the Service Information. Refer to MODULE, RADIO FREQUENCY (RF HUB), REMOVAL .
  - Perform the RADIO FREQUENCY HUB (RF HUB) VERIFICATION TEST. Refer to STANDARD PROCEDURE .