Diagnostic Procedure

STEP	INSPECTION		ACTION
1	Does the sound jump when the vehicle is stopped?	Yes	Go to Step 6.
1	Does the sound jump when the vehicle is stopped?	No	Go to the next step.
2	Drive the vehicle. Does the sound jump when driving over uneven surfaces?	Yes	Go to the next step.
2		No	Go to Step 6.
3	Is the audio unit installed securely?	Yes	Go to the next step.
3	Is the audio unit installed securely?	No	Install the audio unit securely.
4	Inspect the tire pressure. Is the tire pressure normal?	Yes	Replace the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION .)
4	Inspect the tire pressure. Is the tire pressure normal?	No	Go to the next step.
5	Adjust the tire pressure within specification. Does the sound jump when driving the vehicle?	Yes	Replace the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION .)
5		No	Audio system is normal. Explain repairs to the customers.
6	Replace with a CD known to be good. Does the sound jump when driving the vehicle?	Yes	Replace the audio unit. (See AUDIO UNIT REMOVAL/INSTALLATION .)
6		No	Audio system is normal. Explain to the customer that the CD is malfunctioning.