CU AMPS / U1005 08
Read the instructions below then start the fault diagnostic procedure.
Symptom: "On Star System Malfunction. Contact Service." shown on the display.
U1005 08 |
GPS antenna circuit, open/short circuit
Fault symptom
"On Star System Malfunction. Contact Service." shown on the display.On-board diagnosis
Type of diagnosis:
Continuous |
Enable criteria:
Ignition ON. |
Battery voltage must be between 9 - 16 V. |
No starter motor cranking. |
Fault criteria:
The resistance value of the antenna circuit is more/less than 288 ohm due to an open circuit/shorting to ground/B+. |
Checking the wiring harness
Jiggle the wiring harness at several points to detect intermittent breaks or short circuits. Check also the connector for oxidation or loose pins.Diagnostic help
Check that the following MIs/Campaigns have been carried out before starting fault diagnosis:US Market
MI No. 391-2394 - Customer Satisfaction Campaign 15421 - Update of OnStar system.
MI No. 391-2409 - Customer Satisfaction Campaign 15424 - Update of OnStar system.
CA Market
MI No. 391-2410 - Customer Satisfaction Campaign 15421 - Update of OnStar system.
MI No. 391-2408 - Customer Satisfaction Campaign 15424 - Update of OnStar system.