Diagnostic Test

CHECK FOR AN ACTIVE DTC
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. Press the ignition on.
2. With the scan tool, read Radio Frequency Hub Module (RFHM) DTCs and record on the repair order.
3. With the scan tool, erase DTCs.
4. With the scan tool, read RFHM 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 (D920) PASSIVE ENTRY ANTENNA 1 SIGNAL CIRCUIT FOR A SHORT TO VOLTAGE
1. Press the ignition off.
2. Disconnect the RFHM C2 harness connector.
3. Press the ignition on.
  NOTE:
  To Press the ignition on the Passive Entry Keyless Go (PEKG)/Keyless Ignition Node (KIN) system when the RFHM C2 connector is disconnected, use the rounded end of the Key Fob to press the Stop/Start button.
4. Measure the voltage between ground and the (D920) Passive Entry Antenna 1 Signal circuit at the RFHM C2 harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (D920) Passive Entry Antenna 1 Signal circuit for a short to voltage.
  No
  - Go To 3
CHECK THE (D921) PASSIVE ENTRY ANTENNA 1 RETURN CIRCUIT FOR A SHORT TO VOLTAGE
1. Measure the voltage between ground and the (D921) Passive Entry Antenna 1 Return circuit at the RFHM C2 harness connector.
  Is there any voltage present?
  
  Yes
  - Repair the (D921) Passive Entry Antenna 1 Return circuit short to voltage.
  No
  - Go To 4
CHECK RELATED HARNESS CONNECTIONS
1. Disconnect all RFHM 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 RFHM 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 RFHM DTCs.
  Did the DTC return?
  
  Yes
  - Replace the Radio Frequency Hub Module (RFHM) in accordance with the Service Information. Refer to MODULE, RADIO FREQUENCY (RF HUB), REMOVAL AND INSTALLATION .
  - Perform the RADIO FREQUENCY HUB (RF-HUB) VERIFICATION TEST. Refer to RADIO FREQUENCY HUB (RF HUB) VERIFICATION TEST .
  No
  - Perform the RADIO FREQUENCY HUB (RF-HUB) VERIFICATION TEST. Refer to RADIO FREQUENCY HUB (RF HUB) VERIFICATION TEST .
  - Test complete.