Pinpoint Test P: P0A0A:13
- NOTE: The Secondary Inverter System Controller (S-ISC) is referred to as the SOBDMB (Secondary On-Board Diagnostic Control Module B) in the scan tool.
Refer to CHARGING SYSTEM for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Front Electric Drive Assembly - System Operation and Component Description .
DTC Fault Trigger Conditions
DTC Description Fault Trigger Condition SOBDMB P0A0A:13 High Voltage System Interlock Circuit "A": Circuit Open This DTC sets when a high voltage interlock circuit at the Secondary Inverter System Controller (S-ISC) goes open. Possible Sources
- Wiring, terminals or connectors
- Secondary Inverter System Controller (S-ISC)
- WARNING: To prevent the risk of high-voltage shock, always follow precisely all warnings and service instructions, including instructions to depower the system. The high-voltage system utilizes approximately 300 volts DC, provided through high-voltage cables to its components and modules. The high-voltage cables and wiring are identified by orange harness tape or orange wire covering. All high-voltage components are marked with high-voltage warning labels with a high-voltage symbol. Failure to follow these instructions may result in serious personal injury or death.
- NOTE: Use the correct probe adapter(s) from the Flex Probe Kit when taking measurements. Failure to use the correct probe adapter(s) may damage the connector.
- P1 REVIEW AND RECORD THE INTERLOCK DIAGNOSTIC TROUBLE CODES (DTCS)
- Ignition ON.
- Using a scan tool, clear all DTCs.
- Using a scan tool, perform the Secondary Inverter System Controller (S-ISC) self-test and record the DTCs.
Is DTC P0A0A:13 present?
Yes GO to P3 No The concern is not present at this time. The concern may be have been related to prior repair or service that included disconnecting the service disconnect or a high voltage cable. - P2 INSPECT THE SECONDARY INVERTER SYSTEM CONTROLLER (S-ISC) CONNECTOR
- Ignition OFF.
- Depower the high voltage system. REFER to: High Voltage System De-energizing .
- Check that the Secondary Inverter System Controller (S-ISC) C4210A is fully seated.
Is the connector fully seated?
Yes GO to P3 No Repair as necessary. CLEAR the DTCs and REPEAT the self-test. - P3 CHECK FOR AN OPEN IN THE HIGH VOLTAGE CABLE INTERLOCK STAPLE
- Disconnect Secondary Inverter System Controller (S-ISC) C1458B.
Is the resistance less than 3 ohms?
Yes GO to P4 No INSTALL a new (14B322) High Voltage cable assembly. - P4 CHECK FOR CORRECT SECONDARY INVERTER SYSTEM CONTROLLER (S-ISC) OPERATION
- Inspect Secondary Inverter System Controller (S-ISC) C1458B interlock pins.
- For:
- corrosion
- damaged or bent pins
- pushed-out pins
- If any concerns are present INSTALL a new (14B322) high voltage cable. REFER to: High Voltage Battery Cables .
- Reconnect the Secondary Inverter System Controller (S-ISC) C1458B. Make sure it seats and latches correctly.
- Operate the system and determine if the concern is still present.
Is the concern still present?
Yes GO to P5 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. - P5 CHECK FOR SECONDARY INVERTER SYSTEM CONTROLLER (S-ISC) DIAGNOSTIC TROUBLE CODES (DTCS)
- Repower the high voltage system. REFER to: High Voltage System De-energizing .
- Ignition ON.
- Using a diagnostic scan-tool, clear the DTCs.
- Using a diagnostic scan tool, perform the Secondary Inverter System Controller (S-ISC) self-test.
Is Secondary Inverter System Controller (S-ISC) DTC P0A0A:13 present?
Yes CHECK OASIS for any applicable Technical Service Bulletins (TSBs). If a TSB exists for this concern, discontinue this test and follow TSB instructions. If no Technical Service Bulletins (TSBs) address this concern, INSTALL a new Secondary Inverter System Controller (S-ISC). REFER to: Inverter System Controller [SOBDMB] . No The system is operating correctly at this time. The concern may have been caused by module connections.