Gen 2.1 Audio Amplifier Diagnostics

The symptom chart below should be used when diagnosing audio amplifier module faults

REPORTED SYMPTOM	SYMPTOM DESCRIPTION	POTENTIAL CAUSES (FOR GUIDANCE ONLY)	RECOMMENDED ACTION
Complete loss of audio from infotainment system Greyed out AV button -No response to audio function commands	No audio functions or no sound can be heard when audio function is selected Audio functions are not available	Audio amplifier module not correctly installed Circuit connectors to audio amplifier module disconnected or not correctly secured MOST ring break Audio amplifier module fuse failure Data communication error between audio amplifier module and integrated audio module Power feed not present or power/ground circuit fault Audio amplifier module internal failure	Check TOPix for any audio system, audio amplifier module and MOST related SSM/TSBs and perform the specified rectifications as required. Retest to confirm if the issue has been resolved. If the fault is still present, GO to next step Connect the manufacturer approved diagnostic system, check for DTCs and any recommended software updates. If DTCs are present or if software updates are required, perform the necessary remedial actions as specified by the SDD tool. After performing the necessary actions, confirm if the customer fault is still present. If no DTCs are logged and/or no software updates are required, GO to the next step Using the manufacturer approved diagnostic system, run the audio amplifier module On Demand Self-Test (ODST) routine and check for any DTCs that are logged. If DTCs are present, perform the necessary remedial actions as specified by the SDD tool. If the customer fault is still present after performing ODST routine and rectifying DTCs, GO to the next step Using the manufacturer approved diagnostic system, perform a vehicle reset by selecting the "Special Application - vehicle reset" routine. Check for DTCs and confirm if the fault is still present. If issue is still present, GO to the next step Gain access to the audio amplifier module and check the security and integrity of the cable connections to the audio amplifier module with reference to the circuit diagrams. Rectify as required With the infotainment system switched on, disconnect the MOST connector from the audio amplifier module and check that a red light is present at the connector end. This will be steady for a second or two and then start flashing. If no light is present, there is a problem in the MOST ring before the audio amplifier module. Other modules on the MOST ring must be investigated further Perform an audio amplifier module hard reset by disconnecting the power cable to the audio amplifier module for at least 3 minutes. Reconnect the power cable and retest. If the fault is still present, GO to the next step Replace the audio amplifier module and configure as per the instructions outlined on the SDD tool. Confirm if the fault is still present. If issue is still present GO to next step If the fault is still present following replacement of the audio amplifier module, contact JLR Dealer Technical Support following the guidelines in the policy and procedures manual
Loss of audio from one or more channels	Partial loss of sound	Audio amplifier module not correctly installed Circuit connectors to audio amplifier module disconnected or not correctly secured Incorrect EQ file installed on the audio amplifier module Water ingress Speaker fault Data communication error between audio amplifier module and integrated audio module Incorrect software installed on the audio amplifier module Intermittent ground circuit connection fault Audio amplifier module internal failure	Verify the reported fault by performing the following checks: Reset fade and balance settings to the centre of the vehicle Confirm if the issue reported on the customer's vehicle occurs just after engine start up or after the audio system has been running for 10 minutes or more Confirm if the fault is present on all audio sources (CD, Radio, DAB Radio/SDARS, USB, Aux) - if the fault is not present on all sources, investigate affected audio source e.g. if issue is only seen on DAB Radio, check DAB module is functioning correctly and the software is up to date Confirm if the issue is seen on stereo and surround sound settings (if applicable) Check TOPix for any audio system, audio amplifier module and MOST related SSM/TSBs and perform the specified rectifications as required. Retest to confirm if the issue has been resolved. If the fault is still present, GO to next step Connect the manufacturer approved diagnostic system, check for DTCs and any recommended software updates. If DTCs are present or if software updates are required, perform the necessary remedial actions as specified by the SDD tool. After performing the necessary actions, confirm if the customer fault is still present. If no DTCs are logged and/or no software updates are required, GO to the next step Using the manufacturer approved diagnostic system, run the audio amplifier module On Demand Self-Test (ODST) routine and check for any DTCs that are logged. If DTCs are present, perform the necessary remedial actions as specified by the SDD tool. If the customer fault is still present after performing ODST routine and rectifying DTCs, GO to the next step Using the manufacturer approved diagnostic system, perform a vehicle reset by selecting the "Special Application - vehicle reset" routine. Check for DTCs and confirm if the fault is still present. If issue is still present, GO to the next step Gain access to the audio amplifier module and check the security and integrity of the cable connections to the audio amplifier module with reference to the circuit diagrams. Rectify as required With the infotainment system switched on, disconnect the MOST connector from the audio amplifier module and check that a red light is present at the connector end. This will be steady for a second or two and then start flashing. If no light is present, there is a problem in the MOST ring before the audio amplifier module. Other modules on the MOST ring must be investigated further Perform an audio amplifier module hard reset by disconnecting the power cable to the audio amplifier module for at least 3 minutes. Reconnect the power cable and retest. If the fault is still present, GO to the next step Replace the audio amplifier module and configure as per the instructions outlined on the SDD tool. Confirm if the fault is still present. If issue is still present GO to next step If the fault is still present following replacement of the audio amplifier module, contact JLR Dealer Technical Support following the guidelines in the policy and procedures manual
Audio output crackle or distortion	No significant extraneous noise, but the audio reproduction is not as expected e.g. it is not clean sounding