Replacing the ABS brake actuator on a 2008 Lexus LS460 can be a complex process. This article addresses troubleshooting steps for persistent C1345 and related error codes after an actuator replacement.
A 2008 Lexus LS460 with 65,000 miles experienced brake and VSC warning lights accompanied by diagnostic trouble codes (DTCs): C1203, C1241, C1256, C1336, C1345, C1368, C1391, and C1392. The car exhibited harsh braking, inconsistent stopping power, and a constantly running accumulator pump. A used ABS actuator was installed, following a bleeding procedure outlined in a Club Lexus forum post (https://www.clublexus.com/forums/ls-…ssages-10.html).
Despite these efforts, DTCs C1345 (Linear Solenoid Valve Offset Learning undone) and C1368 (Linear Solenoid Valve Offset) persisted. Multiple attempts to clear the codes, including zeroing front and rear, bleeding with the actuator removed, resetting memory, and performing the linear valve offset procedure, were unsuccessful. The ABS and brake warning lights remained illuminated. Although braking performance improved after driving, becoming more linear, the warning lights persisted.
Further attempts to clear C1345 and C1368 resulted in the accumulator ceasing to build pressure. The pump stopped running, and a low accumulator pressure beep sounded upon starting the vehicle. Braking response became delayed. New DTCs appeared: C1253 (Pump Motor Relay) and C1256 (Accumulator Low Pressure), in addition to the persistent C1345 and C1368.
The original ABS actuator is being reinstalled to determine if the issue persists. The brake pump was inspected, revealing no apparent issues with the commutator or brushes. The root cause of the persistent C1345 and related codes, particularly after a used actuator replacement, remains unclear. Possible causes include a faulty replacement actuator, wiring issues, or a problem with the pump motor relay. Further diagnosis is required to pinpoint the source of the problem and implement the correct solution. Addressing the C1345 code is crucial for restoring the full functionality of the ABS and VSC systems. This requires systematic troubleshooting to identify the underlying issue, which could range from a simple electrical connection to a more complex component failure within the ABS system.
