Diagnosis And Testing - Full Open Retractable Roof System

Any diagnosis of the FULL OPEN RETRACTABLE ROOF (FORR) system should begin with a scan tool and proper Diagnostic Procedures. The scan tool can provide confirmation that the FORR Electronic Control Unit (ECU), (sometimes referred to as the Power Top Control Module) is functional, that all of the electronic modules are sending and receiving the proper messages on the Controller Area Network (CAN) Data Bus, and that the power to the FORR is being sent the proper hard wired output by the FORR switch.

Check the condition of the circuit protection and inspect all wiring connector pins for proper engagement and continuity. For complete circuit diagrams, refer to the appropriate wiring information. The wiring information includes wiring diagrams, proper wire and connector repair procedures, details of wire harness routing and retention, connector pin-out information and location views wire harness connectors, splices and grounds.

NOTE:

Roof limits:

Motor Thermal Protection: The ECU Calculates the internal motor temperature. When the calculated temperature exceeds 365F(185C), the ECU allows the roof to only close. At 392F(200C) The ECU prevents motor movement.
System Low Temperature Operation: (Via the Vehicle Ambient Temp Sensor) At 14F (-10C) the ECU does not allow the system to vent without stopping the other motor. At -4F (-20C) the motors are allowed to close only.
Speed Thresholds: At 86 m.p.h. (138 km/h) we stop operation and at 81 m.p.h. (129 km/h) we resume operation.

NOTE:

For the FORR initialization procedure. Refer to Standard Procedure .

SYMPTOM	POSSIBLE CAUSES	CORRECTION
Roof Completely Inoperative	Inoperative control switch	Perform sunroof switch diagnostics
	Inoperative circuit between FORR motor/ECU, control switch, and body harness.	Check the condition of the circuit protection and inspect all wiring. Repair as necessary.
	Inoperative FORR motor/ECU	Replace as necessary Motor/ECU
Audible Whine When Switch Is Depressed, Roof Does Not Operate	Inoperative drive motor gear	Replace drive motor
	Inoperative drive motor gear	Re-initialize ECU: Refer to Standard Procedure .
	Broken or worn drive cable	Replace cables left AND right hand Refer to CABLE, Drive, Removal and CABLE, Retainer, Removal and CABLE, Tension, Removal .
	Broken or worn drive cable	Re-initialize ECU: Refer to Standard Procedure .
Audible Clicking Or Ratcheting When Switch Is Pressed, FORR Does Not Operate.	Cables out of calibration	Left AND right hand cables need to be timed Refer to CABLE, Drive, Removal and CABLE, Retainer, Removal and CABLE, Tension, Removal .
	Cables out of calibration	Re-initialize ECU: Refer to Standard Procedure .
	Cable retainer clip worn or broken	Replace cable retainer clip Refer to CABLE, Drive, Removal and CABLE, Retainer, Removal and CABLE, Tension, Removal .
	Cable retainer clip worn or broken	Re-initialize ECU: Refer to Standard Procedure .
	Broken or worn drive cable	Replace cables left AND right hand Refer to CABLE, Drive, Removal and CABLE, Retainer, Removal and CABLE, Tension, Removal .
	Broken or worn drive cable	Re-initialize ECU: Refer to Standard Procedure .
	Inoperative drive motor gear	Replace drive motor
	Inoperative drive motor gear	Re-initialize ECU: Refer to Standard Procedure .
Front Header Bow Misaligned To Frame	Debris in drive track	Remove debris from track, check cables for wear replace if necessary and reset timing. Refer to CABLE, Drive, Removal or CABLE, Retainer, Removal or CABLE, Tension, Removal .
	Debris in drive track	Re-initialize ECU: Refer to Standard Procedure .
	Broken or worn drive cable	Replace Drive Cables Refer to CABLE, Drive, Removal and CABLE, Retainer, Removal and CABLE, Tension, Removal .
	Broken or worn drive cable	Re-initialize ECU: Refer to Standard Procedure .
	Cables out of time	Left AND right hand cables need to be timed Refer to CABLE, Drive, Removal and CABLE, Retainer, Removal and CABLE, Tension, Removal .
	Cables out of time	Re-initialize ECU: Refer to Standard Procedure .
	Broken cap extension	Replace the front drive assembly. Refer to ASSEMBLY, Drive, Front, Removal and ASSEMBLY, Drive, Rear, Removal .
	Broken cap extension	Re-initialize ECU: Refer to Standard Procedure .
Rear Header Bow Misaligned To Frame	Debris in drive track	Remove Debris from Track, check cables for wear replace if necessary and reset Timing. Refer to CABLE, Drive, Removal and CABLE, Retainer, Removal and CABLE, Tension, Removal .
	Debris in drive track	Re-initialize ECU: Refer to Standard Procedure .
	Broken or worn drive cable	Replace cables left AND right hand Refer to CABLE, Drive, Removal and CABLE, Retainer, Removal and CABLE, Tension, Removal .
	Broken or worn drive cable	Re-initialize ECU: Refer to Standard Procedure .
	Cables out of time	Left AND right hand cables need to be timed Refer to CABLE, Drive, Removal and CABLE, Retainer, Removal and CABLE, Tension, Removal .
	Cables out of time	Re-initialize ECU: Refer to Standard Procedure .
	Broken cap extension	Replace the rear drive assembly. Refer to ASSEMBLY, Drive, Rear, Removal .
	Broken cap extension	Re-initialize ECU: Refer to Standard Procedure .
Front Lift Arm Not Lifting	Spring disengaged from lift arm	Repair or replace spring if necessary Refer to ASSEMBLY, Lift Arm and Bow, Removal .
	Spring disengaged from lift arm	Re-initialize ECU: Refer to Standard Procedure .
	Pin disengaged or broken	Repair or replace nylon pin if necessary Refer to ASSEMBLY, Lift Arm and Bow, Removal .
	Pin disengaged or broken	Re-initialize ECU: Refer to Standard Procedure .
	Lift arm disengaged from cap extension or broken	Repair or replace front lift arm assembly if necessary Refer to ASSEMBLY, Lift Arm and Bow, Removal .
	Lift arm disengaged from cap extension or broken	Re-initialize ECU: Refer to Standard Procedure .
Floating Bows Not Lifting	Spring disengaged	Repair or replace spring if necessary Refer to ASSEMBLY, Lift Arm and Bow, Removal .
	Spring disengaged	Re-initialize ECU: Refer to Standard Procedure .
	Broken lift arm assembly	Replace lift arm assembly if necessary Refer to ASSEMBLY, Lift Arm and Bow, Removal .
	Broken lift arm assembly	Re-initialize ECU: Refer to Standard Procedure .
Top Cover Loose In Side View To Seal	Tension cable not attach at front header	Attach tension cable to front header Refer to Installation .
	Tension cable not attach at front header	Re-initialize ECU: Refer to Standard Procedure .
	Tension cable not attach at rear header	Attach tension cable to rear header Refer to Installation .
	Tension cable not attach at rear header	Re-initialize ECU: Refer to Standard Procedure .
	Tension cable broken	Replace tension cable Refer to CABLE, Drive, Removal or CABLE, Retainer, Removal or CABLE, Tension, Removal .
	Tension cable broken	Re-initialize ECU: Refer to Standard Procedure .
Top Stops Moving Prior To Full Close, Or Full Open	Debris in track	Clean track
	Debris in track	Re-initialize ECU: Refer to Standard Procedure .
	ECU lost normed "home" position	Re-initialize ECU: Refer to Standard Procedure .
Slider Chatter	Debris in track	Clean track
Slider Chatter	Debris in track	Re-initialize ECU: Refer to Standard Procedure .