LI54.10-P-080004

Complaint
• Vehicle cannot be started
• Warning in the instrument cluster related to High-voltage on board electrical system
• The following fault codes related to interlock can be found in the High Voltage Control units :
• PTCU (N127) : P154700 - There is a warning due to a detected fault in the interlock circuit.
• BMS (N82/9) : P0A0B00 - The interlock circuit of the high-voltage on-board electrical system has a malfunction. P0A0D00 - The interlock circuit of the high-voltage on-board electrical system has a short circuit to positive.
• DCB (N116/5): P0A0A00 - The interlock circuit of the high-voltage on-board electrical system has an electrical fault. P0A0B00 - The interlock circuit of the high-voltage on-board electrical system has a malfunction. P0A0C00 - The interlock circuit of the high-voltage on-board electrical system has a short circuit to ground.
• OBL (N83/11) : P0A0B00 - The interlock circuit of the high-voltage on-board electrical system has a malfunction. P0A0C00 - The interlock circuit of the high-voltage on-board electrical system has a short circuit to ground. Cause
• Oxidation in interlock circuit pins of the low voltage connectors in the components
• Twisted harness
• Harness scratching with the body
• Wiring harness chafed/cut at the ECUs
• Broken interlock connector
• Improperly connected HV connectors
• Interlock pins on HV components are bent or deformed Important Note :
• In case of interlock failures, the High-voltage component is less likely to cause the issue. Remedy Remedy 1: Interlock loop resistance measurement (Refer attachment "243 Interlock Resistance Measurements.pdf") Remedy 2: Additional check points for interlock issues