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: B1A74-13-PASSIVE ENTRY ANTENNA 4 - CIRCUIT OPEN 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 .
ANTENNA OPEN
1. Turn the ignition off.
2. Disconnect the Passive Entry Antenna 4 harness connector.
3. Replace Antenna 4 with a known good antenna.
  NOTE:
  For this test you could use one of the other antennas that does not have a DTC set against it. However, it must be from the same vehicle model.
4. Turn the ignition on.
5. Using the scan tool, record and erase the DTCs.
6. With the scan tool, select: RF Hub, More Options and System Tests.
7. Perform the RF Hub LF Antenna Verification Tests.
8. With the scan tool, read the Active DTCs.
  Does the scan tool display: B1A74-13-PASSIVE ENTRY ANTENNA 4 - CIRCUIT OPEN 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 .
(D926) PASSIVE ENTRY ANTENNA 4 SIGNAL CIRCUIT OPEN

Fig 1: Checking Passive Entry Antenna 4 Signal Circuit For Open
Courtesy of CHRYSLER GROUP, LLC
1. Disconnect the Radio Frequency Hub C2 harness connector.
2. Measure the resistance of the (D926) Passive Entry Antenna 4 Signal circuit between the RF HUB C2 harness connector and the Passive Entry Antenna 4 harness connector.
  Is the resistance below 2.0 Ohms?
  
  Yes
  - Go To 4
  No
  - Repair the open in the (D926) Passive Entry Antenna 4 Signal circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(D927) PASSIVE ENTRY ANTENNA 4 RETURN CIRCUIT OPEN

Fig 2: Checking Passive Entry Antenna 4 Return Circuit For Open
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance of the (D927) Passive Entry Antenna 4 Return circuit between the RF HUB C2 harness connector and the Passive Entry Antenna 4 harness connector.
  Is the resistance below 2.0 Ohms?
  
  Yes
  - Go To 5
  No
  - Repair the open in the (D927) Passive Entry Antenna 4 Return circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
(D926) PASSIVE ENTRY ANTENNA 4 SIGNAL CIRCUIT SHORTED TO THE (D927) PASSIVE ENTRY ANTENNA 4 RETURN CIRCUIT OPEN

Fig 3: Measuring Resistance Between Passive Entry Antenna 4 Signal Circuit & Passive Entry Antenna 4 Return Circuit
Courtesy of CHRYSLER GROUP, LLC
1. Measure the resistance between the (D926) Passive Entry Antenna 4 Signal circuit and the (D927) Passive Entry Antenna 4 Return circuit in the RF Hub C2 harness connector.
  Is the resistance below 30K Ohms?
  
  Yes
  - Repair the short between the (D926) Passive Entry Antenna 4 Signal circuit and the (D927) Passive Entry Antenna 4 Return circuit.
  - Perform the BODY VERIFICATION TEST. Refer to STANDARD PROCEDURE .
  No
  - Replace the Radio Frequency Hub (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 .