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
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: B1A71-11-PASSIVE ENTRY ANTENNA 1 - CIRCUIT SHORT TO GROUND 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 SHORTED
1. Turn the ignition off.
2. Disconnect the Passive Entry Antenna 1 harness connector.
3. Turn the ignition on.
4. Using the scan tool, record and erase the DTCs.
5. With the scan tool, select: RF Hub, More Options and System Tests.
6. Perform the RF Hub LF Antenna Verification Tests.
7. With the scan tool, read the Active DTCs.
  Does the scan tool display: B1A71-11-PASSIVE ENTRY ANTENNA 1 - CIRCUIT SHORT TO GROUND as active?
  
  Yes
  - Go To 3
  No
  - Replace the Antenna in accordance with the service information.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(D920) PASSIVE ENTRY ANTENNA 1 SIGNAL CIRCUIT SHORTED TO GROUND

Fig 1: Checking Passive Entry Antenna 1 Signal Circuit For Short To Ground
Courtesy of CHRYSLER GROUP, LLC
1. Turn the ignition off.
2. Disconnect the RF Hub Module C2 harness connector.
3. Measure the resistance between ground and the (D920) Passive Entry Antenna 1 Signal circuit.
  Is the resistance below 30K Ohms?
  
  Yes
  - Repair the short to ground in the (D920) Passive Entry Antenna 1 Signal circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Go To 4
(D921) PASSIVE ENTRY ANTENNA 1 RETURN CIRCUIT SHORTED TO GROUND

Fig 2: Measuring Resistance Between Ground & Passive Entry Antenna 1 Return Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between ground and the (D921) Passive Entry Antenna 1 Return circuit.
  Is the resistance below 30K Ohms?
  
  Yes
  - Repair the short to ground 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 .