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12. BRAKE LAMP SWITCH - PRIMARY SIGNAL OPEN Turn the ignition on. While monitoring the PRIM BRAKE SWITCH status with the scan tool, Does the scan tool display change from RELEASED to Yes >> Adjust or replace the Brake Lamp Switch in accordance with the Service Information. Perform the ECM Verification Test Ver. 1. (Refer to 9 - No >> Go To 13 13. (L950) PRIMARY BRAKE SWITCH SIGNAL CIRCUIT SHORTED TO VOLTAGE Turn the ignition off. Disconnect the ECM harness connectors. Remove the ASD Relay from the IPM. Connect a jumper wire between cavity 30 and cavity 87 of the ASD Turn the ignition on. Measure the voltage between the (L950) Primary Brake Switch Signal Is the voltage above 1.0 volt? Yes >> Repair the (L950) Primary Brake Switch Signal circuit for a short to voltage. Perform the ECM Verification Test Ver. 1. (Refer to 9 - No >> Go To 14 9 - 1452 ENGINE ELECTRICAL DIAGNOSTICS - DIESEL LX |