Step | Action | Value | Yes | No | ||||||||||||
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Important: Electronic modules with an undiagnosed problem may cause Electromagnetic Interference (EMI). An EMI condition may cause radio reception interference. To test for the presence of EMI in a module, systematically disconnect the electronic module connectors one at a time (turn the ignition switch to OFF before disconnecting each module) and note any improvement in radio reception. Do Not disconnect the Inflatable Restraint Sensing and Diagnostic Module (SDM). Refer to Disabling the SIR System in SIR. | ||||||||||||||||
1 | Did you review the Radio/Audio System Description and Operation and perform the necessary inspections? | -- | Go to Step 2 | Go to Symptoms - Entertainment | ||||||||||||
2 | Verify that the radio has poor reception. Does the radio operate normally? | -- | Go to Testing for Intermittent Conditions and Poor Connections in Wiring Systems | Go to Step 3 | ||||||||||||
3 |
Does the radio reception of both vehicles perform the same? | -- | Go to Step 4 | Go to Step 5 | ||||||||||||
4 | Explain to customer the normal operation of the radio observed in both vehicles. Is the explanation complete? | -- | System OK | -- | ||||||||||||
5 |
Does the reception improve? | -- | Go to Step 6 | Go to Step 7 | ||||||||||||
6 | Replace the Antenna assembly. Refer to Radio Antenna Replacement . Is the replacement complete? | -- | Go to Step 23 | -- | ||||||||||||
7 | Inspect for aftermarket wiring. Refer to Checking Aftermarket Accessories in Wiring Systems. Is any aftermarket wiring present? | -- | Go to Step 8 | Go to Step 10 | ||||||||||||
8 | Temporarily disconnect aftermarket wiring (both the battery and ground connections. Does the radio reception improve? | -- | Go to Step 9 | Go to Step 10 | ||||||||||||
9 | Remove the aftermarket wiring. Is the repair complete? | -- | Go to Step 21 | -- | ||||||||||||
10 | Compare the radio reception with the ignition switch in the following positions:
Does the radio reception change with the key in the ON position (engine not running) or in the ON position (engine running)? | -- | Go to Step 11 | Go to Step 13 | ||||||||||||
11 | Was the radio reception degraded with the ignition key in the ON position (engine not running)? | -- | Go to Step 13 | Go to Step 12 | ||||||||||||
12 | Was the radio reception degraded with the ignition key in the ON position (engine running)? | -- | Go to Step 13 | Go to Step 15 | ||||||||||||
13 | Test for Electromagnetic Interference (EMI) - (See Important). Was an EMI condition found in an electronic module? | -- | Go to Step 14 | Go to Step 15 | ||||||||||||
14 | Replace the faulty module. Has the radio reception improved? | -- | System OK | Go to Step 15 | ||||||||||||
15 | Using J 39200 set to measure AC voltage, connect the positive lead to the negative battery terminal and the negative lead of the DMM to a non-painted surface in the engine compartment. Is the AC voltage less than the specified value? | 25 mV | Go to Step 17 | Go to Step 16 | ||||||||||||
16 | Repair the poor ground condition in one or more of the following ground connections:
Refer to Harness Routing Views in Wiring Systems for locations. Is the repair(s) complete? | -- | Go to Step 21 | -- | ||||||||||||
17 | Using J 39200 set to measure AC voltage, connect the positive lead to the negative battery terminal and the negative lead to a non-painted surface of the A-pillar. Is the AC voltage less than the specified value? | 25 mV | Go to Step 19 | Go to Step 18 | ||||||||||||
18 | Repair the poor ground condition in one or more of the following ground connections:
Refer to Harness Routing Views in Wiring Systems for locations. Is the repair(s) complete? | -- | Go to Step 21 | -- | ||||||||||||
19 | Using J 39200 set to measure AC voltage, connect the positive lead to the Negative battery terminal and the negative lead to a non-painted surface in the rear door. Is the AC voltage less than the specified value? | 25 mV | Go to Step 22 | Go to Step 20 | ||||||||||||
20 | Repair the poor ground condition at one or more of the following ground connections:
Refer to Harness Routing Views in Wiring Systems for locations. Is the repair(s) complete? | -- | Go to Step 21 | -- | ||||||||||||
21 | Has the radio reception improved? | -- | Go to Step 23 | Go to Step 22 | ||||||||||||
22 | Replace the radio. Refer to Radio Replacement . Is the replacement complete? | -- | Go to Step 23 | -- | ||||||||||||
23 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 3 | ||||||||||||
