Inspection And Verification: Notes

CAUTION: Diagnosis by substitution from a donor vehicle is NOT acceptable. Substitution of control modules does not guarantee confirmation of a fault and may also cause additional faults in the vehicle being checked and/or the donor vehicle.

NOTE: Check and rectify basic faults before beginning diagnostic routines involving pinpoint tests.

Verify the customer concern.

Visually inspect for obvious signs of mechanical or electrical damage.

Visual Inspection

Mechanical	Electrical
Check all information and entertainment system modules Compact disc player jammed, not loading Scratched/dirty compact discs Speakers Switch(s) stuck or damaged	Fuses Electrical harnesses Harness connectors Battery condition, state of charge

If an obvious cause for an observed or reported concern is found, correct the cause (if possible) before proceeding to the next step.
If the cause is not visually evident, verify the symptom and refer to the Symptom Chart, alternatively check for Diagnostic Trouble Codes (DTCs) and refer to the DTC Index.

Symptom	Display	Possible Causes	Action
Poor audio quality (all sources)	Display normal	MOST harness connections loose MOST harness connections MOST harness misrouted Too many bends Bend radius exceeding 25mm	Check MOST harness connectors for security Check MOST harness connectors for contamination Check the routing of the MOST harness
Information and entertainment system inoperative	Touch screen displaying logo or blank	MOST network fault	REFER to: Communications Network (418-00 Module Communications Network, Diagnosis and Testing).
NOTE: Satellite Digital Audio Service (SDARS) applies to NAS market vehicles only No Satellite Digital Audio Service (SDARS) channels available	No signal or Acquiring signal	Vehicle not in USA Poor signal reception Satellite Digital Audio Service (SDARS) system fault	No fault to rectify The vehicle must have clear line of sight to a satellite, which means being outside and having no blockages between the vehicle and the satellite Using the manufacturer approved diagnostic system, check the Satellite Radio Control Module (SRCM) for related DTCs and refer to the relevant DTC index
NOTE: Satellite Digital Audio Service (SDARS) applies to NAS market vehicles only Only one Satellite Digital Audio Service (SDARS) channel available (channel 184)	Unsubscribed	Channel 184 is available without subscription for a limited period (6 months)	No fault to rectify. Subscribe to Satellite Digital Audio Service (SDARS) to resume service
NOTE: Satellite Digital Audio Service (SDARS) applies to NAS market vehicles only No Satellite Digital Audio Service (SDARS) channels available after 6 months without subscribing	Unsubscribed	Channel 184 is available without subscription for a limited period (6 months)	No fault to rectify. Subscribe to Satellite Digital Audio Service (SDARS) to resume service
NOTE: Satellite Digital Audio Service (SDARS) applies to NAS market vehicles only Some Satellite Digital Audio Service (SDARS) unavailable	Unsubscribed	Adult channels blocked by subscription type (family package)	No fault to rectify. Subscribe to Satellite Digital Audio Service (SDARS) full package to receive adult channels
NOTE: Satellite Digital Audio Service (SDARS) applies to NAS market vehicles only Satellite Digital Audio Service (SDARS) pay channels unavailable	Unsubscribed	Payment not made	No fault to rectify