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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.