Diagnostic Test

Fig 1: Connecting Scan Tool & Turning Ignition On

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Turn the ignition on.

With the DRBIII®, read Current DTCs.

Are the Rear Bow Switch and the Tonneau Cover Switch Open DTCs set? 

Yes 

1. Check and repair the Switches common ground circuit for a loose, damaged or corroded ground circuit.
2. Perform POWER TOP VERIFICATION TEST .

No 

1. Go To step  2).

Fig 2: Checking Switch Sense Circuit & Ground Circuit

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Turn the ignition off.

Disconnect the Rear Bow Switch harness connector.

Connect a fused jumper wire between the Rear Bow Switch Sense circuit and the Rear Bow Switch Ground circuit of the Rear Bow Switch harness connector.

Turn the ignition on.

With DRBIII®, select Input/Output Display and monitor the REAR BOW SW SENSE.

Does the REAR BOW SW SENSE read "LOCKED"? 

Yes 

1. Replace the Rear Bow Switch.
2. Perform POWER TOP VERIFICATION TEST .

No 

1. Go To step  3).

Fig 3: Checking Switch Sense Circuit & Ground Circuit

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Turn the ignition off.

Remove fused jumper wire.

Disconnect the Power Top Control Module C1 harness connector.

Measure the resistance of the Rear Bow Switch Sense circuit from the Rear Bow Switch harness connector to the Power Top Control Module C1 harness connector.

Is the resistance below 5.0 ohms? 

Yes 

1. Go To step  4).

No 

1. Repair the Rear Bow Switch Sense circuit for an open.
2. Perform POWER TOP VERIFICATION TEST .

Fig 4: Checking Switch Ground Circuit

Courtesy of DAIMLERCHRYSLER CORP.

With the ignition off.

Measure the resistance between ground and the Rear Bow Switch ground circuit.

Is the resistance below 5.0 ohms? 

Yes 

1. Replace the Power Top Control Module. (Refer to ELECTRICAL/ELECTRONIC CONTROL MODULES/POWER TOP CONTROL MODULE - REMOVAL) .
2. Perform POWER TOP VERIFICATION TEST .

No 

1. Repair the Rear Bow Switch Ground circuit for an open.
2. Perform POWER TOP VERIFICATION TEST .