Were you sent here from the Exterior Lights System Check?

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Go to Step 2

Go to Exterior Lights System Check

Using a scan tool, check for either DTC B2578 or B2583 stored in the BCM memory.

Are either of these codes stored in memory?

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Go to applicable diagnostic table

Go to Step 3

1. Disconnect the hazard warning switch connector.
2. Connect a DMM between the hazard warning switch connector terminal C and ground.
3. Measure the voltage available at the connector.

Is the voltage within the specified values?

10.0-14.0V

Go to Step 7

Go to Step 4

Check the HAZ T/SG MiniFuse® #15 for an open circuit.

Is the fuse open?

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Go to Step 5

Go to Step 6

Repair a short to ground in CKT 1739.

Is the repair complete?

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Go to Exterior Lights System Check

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Repair a poor connection or an open in CKT 1739.

Is the repair complete?

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Go to Exterior Lights System Check

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1. Disconnect the connector C209.
2. Connect a DMM between the hazard warning switch connector terminal H and connector C209 terminal D.
3. Measure CKT 16 for continuity between these two connector terminals.

Is continuity present in CKT 16 between these two connectors?

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Go to Step 9

Go to Step 8

Repair the open in CKT 16.

Is the repair complete?

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Go to Exterior Lights System Check

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1. Reconnect the hazard warning switch connector.
2. Connect a DMM between the connector C209 terminal D and ground.
3. Measure the available voltage at C209 terminal D.

Is the voltage within the specified values?

10.0-14.0V

Go to Step 11

Go to Step 10

Replace the hazard warning switch .

Is the repair complete?

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Go to Exterior Lights System Check

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Replace the turn signal switch.

Is the repair complete?

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Go to Exterior Lights System Check

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