Step | Action | Value(s) | Yes | No |
|---|---|---|---|---|
Schematic Reference: OnStar Schematics Connector End View Reference: Component Connector End Views | ||||
1 | Did you perform the Diagnostic System Check - Vehicle? | -- | Go to Step 2 | |
2 |
Is the radio reception clear? | -- | Go to Step 3 | |
3 |
Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 4 |
4 | Does poor or no reception occur only on AM? | -- | Go to Step 5 | Go to Step 6 |
5 |
Does the voltage measure near the specified value? | 12 V | Go to Step 6 | Go to Step 9 |
6 |
Important: Always zero out the DMM before taking a resistance measurement to ensure an accurate reading. Does the resistance measure greater than the specified value? | 0.20 Ω | Go to Step 10 | Go to Step 7 |
7 |
Important: Always zero out the DMM before taking a resistance measurement to ensure an accurate reading.
Does the resistance measure greater than the specified values? | RG-58/RG-59 Coax: 0.20 Ω RG-62/RG-62M Coax: 3.5 Ω | Go to Step 11 | Go to Step 8 |
8 |
Did you measure continuity? | -- | Go to Step 15 | Go to Step 12 |
9 | Test the antenna relay coil voltage circuit for an open, short to ground or high resistance. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 13 |
10 | Test the antenna amplifier module case ground for an open or high resistance. Refer to Circuit Testing . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 14 |
11 | Inspect the antenna coaxial cable interconnects for a poor connection or corrosion. Refer to Testing for Intermittent Conditions and Poor Connections . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 15 |
12 | Inspect for poor connections at the antenna amplifier module. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 16 |
13 | Inspect for poor connections at the radio. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 17 |
14 | Test for an open or high resistance from the negative battery cable to body ground. Refer to Circuit Testing and Wiring Repairs . Did you find and correct the condition? | -- | Go to Step 18 | Go to Step 11 |
15 | Replace the antenna coaxial cable. Did you complete the replacement? | -- | Go to Step 18 | -- |
16 | Replace the antenna amplifier module. Did you complete the replacement? | -- | Go to Step 18 | -- |
17 |
Important:: Perform the setup procedure after replacing the radio. Replace the radio. Refer to Radio Replacement . Did you complete the replacement? | -- | Go to Step 18 | -- |
18 | Operate the system in order to verify the repair. Did you correct the condition? | -- | System OK | Go to Step 2 |
