Pinpoint Test BP: Abs (Anti-Lock Brake System) Module Communication Concern With The IPMA (Image Processing Module A)
- Refer to Vehicle Dynamic Systems
for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .
The IPMA is part of the Advanced Driver Assistance System (ADAS).
With the ignition ON, the IPMA sends messages to the ABS module the over the HS-CAN2. If the ABS module does not receive these messages within a certain time frame, the module sets Diagnostic Trouble Codes (DTCs). This can be due to an IPMA failure, a circuit failure on the network or an excessive load on the network.
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition ABS U023A:87 Lost Communication With Image Processing Module A: Missing Message sets in the ABS module when the adaptive cruise control data message from the IPMA is missing for more than the allotted time. ABS U053B:82 Invalid Data Received From Image Processing Module A: Alive/Sequence Counter Incorrect/Not Updated sets in the ABS module when the counter signal value in the adaptive cruise control data message from the IPMA does not increase. ABS U053B:83 Invalid Data Received From Image Processing Module A: Value Of Signal Protection Calculation Incorrect sets in the ABS module when an invalid checksum value is received in the adaptive cruise control data message from the IPMA. ABS U053B:86 Invalid Data Received From Image Processing Module A: Signal Invalid sets in the ABS module when the brake precharge request is received from the IPMA with an invalid or incorrect signal value. Possible Causes
- Network communication concern
- IPMA
- BP1 CHECK THE COMMUNICATION NETWORK
- Ignition ON.
- Using a diagnostic scan tool, carry out the Network Test.
Does the IPMA pass the Network Test?
Yes RETRIEVE and RECORD all IPMA DTCs. REFER to appropriate service information. If there are no DTCs in the IPMA, GO to BP2. No DIAGNOSE the no communication with the IPMA. REFER to DIAGNOSIS AND TESTING . - BP2 RECHECK THE ABS (ANTI-LOCK BRAKE SYSTEM) DTCS
- Put the ABS module in sleep mode by performing the following steps:
- With ALL doors closed, set the ignition from ON to OFF.
- Disconnect the diagnostic scan tool.
- Open the door, exit the vehicle and close the door.
- Wait a minimum of 90 seconds for the ABS module to enter sleep mode.
- Ignition ON.
- Retrieve and record the ABS module DTCs.
Do any of the DTCs listed in the DTC Fault Trigger Conditions table return?
Yes GO to BP3. No The system is operating correctly at this time. The DTC may have been set due to high network traffic or an intermittent fault condition. - Put the ABS module in sleep mode by performing the following steps:
- BP3 REVIEW THE RECORDED DTCS FROM THE ABS (ANTI-LOCK BRAKE SYSTEM) MODULE SELF-TEST
- Review the recorded DTCs from the ABS module self-test.
Is DTC U3003:16 or U3003:17 recorded?
Yes REFER to the DIAGNOSTIC TROUBLE CODE (DTC) CHART . No GO to BP4. - BP4 CHECK FOR DTCS IN THE IPMA (IMAGE PROCESSING MODULE A)
Are any DTCs present in the IPMA?
Yes DIAGNOSE the IPMA DTCs. REFER to appropriate service information. No GO to BP5. - BP5 CHECK FOR OTHER CAUSES OF COMMUNICATION NETWORK CONCERNNOTE: If new modules were installed prior to the DTC being set, the module configuration can be incorrectly set during the PMI or the PMI may not have been carried out.
- Check the vehicle service history for recent service actions related to the IPMA or the ABS module. If recent service history is found:
- Verify the correct replacement module was installed. HVBOM may be used to verify correct part fitment.
- Verify the configuration of replacement module was correct. Re-configure the module using as-built data if prior configuration is suspect.
- Verify the module was not obtained from a like vehicle and installed into customer vehicle. Return the swapped module to source vehicle and obtain new replacement module.
- Operate the system and determine if the observable symptom is still present.
Is the observable symptom still present?
Yes GO to BP6. No The system is operating correctly at this time. The concern may have been due to incorrect parts replacement procedures or incorrect module configuration. - Check the vehicle service history for recent service actions related to the IPMA or the ABS module. If recent service history is found:
- BP6 CHECK FOR COMMUNICATION DTCS SET IN OTHER MODULES
- Press Read Vehicle Information button to retrieve DTCs from the vehicle. NOTE: DTCs may be displayed from previous diagnostic actions.
Is any DTC from the Fault Trigger Conditions Table set in 1 or more modules in addition to the ABS module?
Yes GO to BP7. No GO to BP8. - BP7 CHECK FOR CORRECT IPMA (IMAGE PROCESSING MODULE A) OPERATION
- Ignition OFF.
- Put the ABS module in sleep mode by performing the following steps:
- With ALL doors closed, set the ignition from ON to OFF.
- Disconnect the diagnostic scan tool.
- Open the door, exit the vehicle and close the door.
- Wait a minimum of 90 seconds for the ABS module to enter sleep mode.
- Disconnect IPMA connector.
- Disconnect ABS-A Module connector.
- Disconnect ABS-B Module connector.
- Using a good light source, inspect all disconnected electrical connectors for the following:
- corrosion - install new connector or terminal and clean the module pins
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary
- spread terminals - install new terminals as necessary
- Connect ABS-B Module connector. Make sure the connector seats and latches correctly.
- Connect ABS-A Module connector. Make sure the connector seats and latches correctly.
- Disconnect IPMA connector. Make sure the connector seats and latches correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes CHECK OASIS for any service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no services articles address this concern, INSTALL a new IPMA. REFER to INTERIOR REAR VIEW MIRROR . No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues. - BP8 CHECK FOR CORRECT ABS (ANTI-LOCK BRAKE SYSTEM) OPERATION
- Put the ABS module in sleep mode by performing the following steps:
- With ALL doors closed, set the ignition from ON to OFF.
- Disconnect the diagnostic scan tool.
- Open the door, exit the vehicle and close the door.
- Wait a minimum of 90 seconds for the ABS module to enter sleep mode.
- Disconnect ABS-A Module connector.
- Disconnect ABS-B Module connector.
- Disconnect IPMA connector.
- Using a good light source, inspect all disconnected electrical connectors for the following:
- corrosion - install new connector or terminal and clean the module pins
- damaged or bent pins - install new terminals or pins
- pushed-out pins - install new pins as necessary
- spread terminals - install new terminals as necessary
- Disconnect IPMA connector. Make sure the connector seats and latches correctly.
- Connect ABS-B Module connector. Make sure the connector seats and latches correctly.
- Connect ABS-A Module connector. Make sure the connector seats and latches correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes The HCU and ABS module are a single assembly known as the EBB unit. Check OASIS for any service articles: TSB, GSB, SSM or FSA. If a service article exists for this concern, DISCONTINUE this test and FOLLOW the service article instructions. If no service articles address this concern, INSTALL a new EBB unit. REFER to: Electric Brake Booster (EBB) . No The system is operating correctly at this time. The concern may have been caused by module connections. ADDRESS the root cause of any connector or pin issues. - Put the ABS module in sleep mode by performing the following steps: