Heated Mirrors Inoperative - One. Cadillac STS 2007

For 1990-2009 cars only

Makes 🢒 Cadillac 🢒 2007 🢒 STS 🢒 Diagnostic Navigation 🢒 Vehicle Diagnostic Information 🢒 Heated Mirrors Inoperative - One

Step	Action	Yes	No
Schematic Reference: Outside Rearview Mirror Schematics Connector End View Reference: Mirror Connector End Views
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Verify that the Heated Mirrors Inoperative - One complaint is present. Does the heated mirrors system operate as described in the Description and Operation?	Go to Testing for Intermittent Conditions and Poor Connections	Go to Step 3
3	Turn OFF the ignition. Disconnect the C 4 harness connector at the door control module associated with the inoperative heated mirror. Ensure that all other harness connectors to the door control module remain connected. Connect a test lamp between the mirror heating element supply voltage circuit and the mirror heating element low reference circuit at the door control module pins. Turn ON the ignition, with the engine OFF. Does the test lamp illuminate?	Go to Step 9	Go to Step 4
4	While observing the test lamp, command the mirrors to heat by turning ON the rear window defroster. Does the test lamp illuminate?	Go to Step 5	Go to Step 9
5	Turn OFF the ignition. Carefully remove the mirror face of the mirror that does not heat. Refer to Outside Rearview Mirror Glass Replacement . Disconnect the heated mirror harness connector from the mirror face. Connect a test lamp between the mirror heater circuits of the harness connector. Turn ON the ignition, with the engine OFF. Does the test lamp illuminate?	Go to Step 7	Go to Step 6
6	While observing the test lamp, command the mirrors to heat by turning ON the rear window defroster. Does the test lamp illuminate?	Go to Step 8	Go to Step 7
7	Inspect for poor connections at the harness connector of the inoperative heated rearview mirror. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 13	Go to Step 12
8	Inspect for poor connections at the harness connector of the inoperative heated mirror face. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 13	Go to Step 10
9	Inspect for poor connections at the C 4 harness connector of the door control module associated with the inoperative outside rearview mirror. Refer to Testing for Intermittent Conditions and Poor Connections and Connector Repairs . Did you find and correct the condition?	Go to Step 13	Go to Step 11
10	Replace the inoperative heated rearview mirror face. Refer to Outside Rearview Mirror Glass Replacement . Did you complete the replacement?	Go to Step 13	--
11	Replace the door control module associated with the inoperative outside rearview mirror. Refer to Control Module References . Did you complete the replacement?	Go to Step 13	--
12	Replace the inoperative heated rearview mirror. Refer to Outside Rearview Mirror Replacement . Did you complete the replacement?	Go to Step 13	--
13	Operate the system in order to verify the repair. Did you correct the condition?	System OK	Go to Step 2