Land Rover OEM M26 Radio Amplifier P9XM-19C164-EA

Land Rover OEM M26 Radio Amplifier P9XM-19C164-EA

The P9XM-19C164-EA radio amplifier is a critical component in JLR's Meridian audio systems, managing digital signal processing for up to 14 speakers. For technicians, proper replacement requires advanced tools like the JET Master SX Tool for CCF (Car Configuration File) editing. This addresses the common challenge of amplifier failures causing complete audio loss, where simple part swaps without proper programming result in MOST bus communication failures and configuration mismatch errors.

Technical Specifications and Functionality

The P9XM-19C164-EA operates as a node on the MOST150 fiber optic network. Key technical characteristics:

• Input: Digital audio via MOST150 ring (500Mb/s bandwidth)
• Output: 14-channel amplified output (380W peak in Meridian systems)
• Control: Diagnostics via DOIP (Diagnostics over Internet Protocol)
• Configuration: CCF-defined parameters for EQ curves, speaker impedance, and ANC (Active Noise Cancellation)

The amplifier interfaces with the Vehicle Audio Control Module (VACM) and requires precise impedance matching to prevent overload shutdown.

Required Tools and Equipment

Essential tools for replacement and programming:

• JLR DOIP VCI Wifi Bosch Diagnostic Tool – Mandatory for network communication
• Industrial battery maintainer (70A minimum, stable 13.5V output)
• JET Master SX Tool with TOPIx Cloud access for CCF editing
• SDD Pathfinder v220+ for diagnostics and calibration
• MOST150 fiber optic break-out box (JLR part LR-125-040)

Step-by-Step Replacement Procedure

1. Pre-Diagnosis: Connect DOIP VCI. Run SDD Pathfinder session. Record amplifier DTCs and configuration data.
2. Physical Replacement:
   • Disconnect battery negative terminal
   • Access amplifier (located behind the glove box in L538/L560)
   • Disconnect MOST150 optical connectors and electrical harness
   • Install new P9XM-19C164-EA amplifier
3. Programming:
   • Connect JET Master SX Tool via ENET/WiFi
   • Download vehicle CCF from TOPIx Cloud
   • Write the base configuration for the new amplifier
   • Synchronize VIN with VACM module
4. Calibration: Run the “Audio Output Calibration” routine in SDD Pathfinder
5. Validation: Check MOST bus integrity and audio channel balance

Common Programming Challenges and Solutions

Configuration Mismatch Errors (U1B00-87)

After installation:

• Verify CCF contains the correct amplifier hardware descriptor (HWID)
• Check TOPIx for the latest amplifier firmware version
• Perform module reset via JET Master's “Force Configuration Reload”

Amplifier Not Recognized on Network

If SDD shows “Module Not Responding”:

• Confirm MOST ring integrity with break-out box
• Check the power supply to the amplifier (Pin 1: Battery+, Pin 7: Ground)
• Verify CCF programming is completed successfully

Professional Tool Recommendation

For reliable amplifier programming, the JLR DOIP VCI Wifi Bosch Diagnostic Tool provides:

• Factory-level DOIP communication with HS-CAN and MOST networks
• Integrated WiFi for wireless SDD Pathfinder sessions
• Compatibility with JET Master SX Tool for advanced CCF editing
• Real-time voltage monitoring during critical programming phases

For complex audio system programming, the JLR SX Tool Jet Master enables full CCF management capabilities.

Critical Technical Takeaways

• Always perform CCF backup before amplifier replacement
• MOST fiber connectors require JLR-specific tools for safe removal
• Power stability is critical – voltage drops below 12.5V during programming cause CCF corruption
• Post-installation calibration is mandatory for ANC and speaker protection functions

For professional JLR diagnostic tools and support, including Radio Amplifier programming solutions, visit jlrupgrades.com. Our DOIP interfaces are validated for all P9XM-19C164-EA applications.