Trunk Release Relay Circuit Test

NOTE: Perform TRUNK RELEASE RELAY TEST under COMPONENT TESTS before proceeding. Trunk release relay connector terminal numbers are numbered differently in this test than in wiring diagram. See TRUNK RELEASE RELAY TERMINAL IDENTIFICATION table.

Using a voltmeter connected to ground, backprobe relay connector terminal No. 30. See Fig 1 . If battery voltage exists, go to next step. If battery voltage does not exist, repair open common feed circuit (Red wire) between battery and relay connector.
Using voltmeter connected to ground, backprobe relay connector terminal No. 87, with and without pressing trunk release button on Remote Keyless Entry (RKE) transmitter. Voltage should not exist without button being pressed (normally open). Voltage should exist when button is pressed. If relay connector tests as specified, go to next step. If relay connector does not test as specified, repair open trunk release solenoid circuit (Light Green/Black wire) between trunk release solenoid and relay connector.
Using voltmeter connected to ground, backprobe relay terminal No. 86. If battery voltage exists, go to next step. If battery voltage does not exist, repair open coil battery circuit (Red wire circuit) between battery and relay connector.
Using voltmeter connected to ground, backprobe relay terminal No. 85, with and without pressing trunk release button on RKE transmitter. Voltage should exist only when button is pressed. If relay connector does not test as specified, repair open coil ground circuit (Brown/Light Blue) wire between BCM and relay connector. If relay connector tests as specified, go to SYSTEM TESTS .

TRUNK RELEASE RELAY TERMINAL IDENTIFICATION

Terminal No. In Test ⁽¹⁾

⁽²⁾ Terminal No. In Wiring Diagram

87A

⁽³⁾

⁽¹⁾	See Fig 1 .

⁽²⁾	See WIRING DIAGRAMS .

⁽³⁾	Terminal is not identified in wiring diagram.

Fig 1: Identifying Trunk Release Relay Terminals

Courtesy of DAIMLERCHRYSLER CORP.