Diagnostic Test

CHECK FOR AN ACTIVE DTC
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.
1. Turn the ignition on.
2. With the scan tool, read RF Hub DTCs and record on the repair order.
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 RF Hub DTCs.
  Is the DTC active?
  
  Yes
  - Go To 2
  No
  - Perform the TESTING FOR AN INTERMITTENT CONDITION procedure. Refer to TESTING FOR AN INTERMITTENT CONDITION .
CHECK THE PASSIVE ENTRY ANTENNA FOR A SHORT
1. Turn the ignition off.
2. Disconnect the Passive Entry Antenna 1 harness connector.
3. Turn the ignition on.
4. With the scan tool, read RF Hub 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 RF Hub DTCs.
  Is the DTC active?
  
  Yes
  - Go To 3
  No
  - Replace the Passive Entry Antenna 1 in accordance with the service information. Refer to ANTENNA, PASSIVE ENTRY, REMOVAL .
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
CHECK THE (D920) PASSIVE ENTRY ANTENNA 1 SIGNAL CIRCUIT FOR A SHORT TO GROUND
1. Turn the ignition off.
2. Disconnect the RF Hub Module C2 harness connector.
3. Check for continuity between ground and the (D920) Passive Entry Antenna 1 Signal circuit at the RF Hub Module C2 harness connector.
  Is there continuity between ground and the Passive Entry Antenna 1 Signal circuit?
  
  Yes
  - Repair the Passive Entry Antenna 1 Signal circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 4
CHECK THE (D921) PASSIVE ENTRY ANTENNA 1 RETURN CIRCUIT FOR A SHORT TO GROUND
1. Check for continuity between ground and the (D921) Passive Entry Antenna 1 Return circuit at the RF Hub Module C2 harness connector.
  Is there continuity between ground and the (D921) Passive Entry Antenna 1 Return circuit?
  
  Yes
  - Repair the (D921) Passive Entry Antenna 1 Return circuit for a short to ground.
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  No
  - Go To 5
CHECK THE PASSIVE ENTRY ANTENNA 1 AND RF HUB
1. Replace the Passive Entry Antenna 1 in accordance with Service Information. Refer to ANTENNA, PASSIVE ENTRY, REMOVAL .
2. Turn the ignition on.
3. Using the scan tool, record and erase the DTCs.
4. With the scan tool, select: RF Hub, More Options and System Tests.
5. Perform the RF Hub LF Antenna Verification Tests.
6. With the scan tool, read the Active DTCs.
  Does the scan tool display this DTC as active?
  
  Yes
  - Go To 6
  No
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  - Test complete.
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all RF Hub harness connectors.
2. Disconnect all related in-line harness connections (if equipped).
3. Disconnect the related component harness connectors.
4. Inspect harness connectors, component connectors, and all male and female terminals for the following conditions:
  - Proper connector installation.
  - Damaged connector locks.
  - Corrosion.
  - Other signs of water intrusion.
  - Weather seal damage (if equipped).
  - Bent terminals.
  - Overheating due to a poor connection (terminal may be discolored due to excessive current draw).
  - Terminals that have been pushed back into the connector cavity.
  - Perform a terminal drag test on each connector terminal to verify proper terminal tension.
  Repair any conditions that are found.
5. Reconnect all RF Hub Module harness connectors. Be certain that all harness connectors are fully seated and the connector locks are fully engaged.
6. Reconnect all in-line harness connectors (if equipped). Be certain that all connectors are fully seated and the connector locks are fully engaged.
7. Reconnect all related component harness connectors. Be certain that all connectors are fully seated and the connector locks are fully engaged.
8. With the scan tool, erase DTCs.
9. Using the recorded Vehicle Scan Report, along with the When Monitored and Set Conditions above, operate the vehicle in the conditions that set the DTC.
10. With the scan tool, read RF Hub DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Radio Frequency Hub (RF Hub) Module in accordance with the Service Information. Refer to MODULE, RADIO FREQUENCY (RF HUB), REMOVAL .
  - If this vehicle is equipped with a Steering Column Lock Module (BUX), it must also be replaced in accordance with the Service Information. When replacing the RF-Hub and the Steering Column Lock Module, the RF-Hub MUST be programmed BEFORE the Steering Column Lock Module (ELV) is programmed.
  - Replace the Steering Column Lock Module (ELV/ESCL) in accordance with the Service Information.
  - Perform the RADIO FREQUENCY HUB VERIFICATION TEST. Refer to RADIO FREQUENCY (RF HUB) VERIFICATION TEST .
  No
  - Perform the BODY VERIFICATION TEST. Refer to BODY VERIFICATION TEST .
  - Test complete.