• | Perform the Diagnostic System Check - Vehicle prior to using this diagnostic procedure. |
• | Review Strategy Based Diagnosis for an overview of the diagnostic approach. |
• | Diagnostic Procedure Instructions provides an overview of each diagnostic category. |
Circuit | Short to Ground | Open/High Resistance | Short to Voltage | Signal Performance |
---|---|---|---|---|
Rear Access Panel Relay B+ | 2 | 2 | -- | -- |
Right Access Panel Release Signal | 1,2 | 1 | 1 | -- |
Left Access Panel Release Signal | 1,2 | 1 | 1 | -- |
Underhood Interlock Relay Control | B312A 02 | B312A 05 | B312A 05 | -- |
LH Access Panel Relay Control | B250D 00 | B250D 00 | B250D 00 | -- |
RH Access Panel Relay Control | B250E 00 | B250E 00 | B250E 00 | -- |
Access Panel Latch Interlock Control | 2 | 2 | -- | -- |
RH Access Panel Latch Control | 2 | 2 | 2 | -- |
LH Access Panel Latch Control | 2 | 2 | 2 | -- |
Rear Access Panel Switch Ground | -- | 1 | 1 | -- |
Underhood Interlock Relay Ground | -- | 2 | 2 | -- |
1. Rear Access Panel Switch Inoperative. 2. Rear Access Panel Latch Inoperative. |
The access panel release system consists of a interlock relay, 2 release relays, 3 release switches and 2 latches. When the appropriate release switch is pressed, the door request signal circuit to the body control module (BCM) is grounded, the BCM detects a drop in voltage and the BCM enables the access panel release system by supplying ground to the appropriate door relay coil. With the relay energized, battery positive voltage is allowed from the relay switched input through the switch contacts and out the relay switched output to the appropriate access panel and latch.
Access Panel Description and Operation
Control Module References for scan tool information
⇒ | If the parameters do not change, refer to Access Panel Switch Malfunction. |
⇒ | If the parameter does not change, refer to Access Panel Interlock Malfunction. |
⇒ | If both rear access panel latches do not release, refer to Access Panel Interlock Malfunction |
⇒ | If a rear access panel latch does not release, refer to Rear Access Panel Release Malfunction. |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If not the specified value, test the signal circuit terminal C for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If not the specified value, test the signal circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If greater than the specified range, test the ground circuit for an open/high resistance. |
⇒ | If the test lamp is always ON, test the control circuit for a short to voltage. If the circuit tests normal, replace the IPC. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to ground or open/high resistance. If the circuit tests normal, replace the IPC. |
⇒ | If the test lamp does not illuminate, test the control circuit for short to ground or an open/high resistance. |
⇒ | If the test lamp illuminates, test the output circuit for a short to voltage. |
⇒ | If the test lamp does not illuminate, test the B+ circuit for a short to ground or an open/high resistance. If the circuit tests normal and the B+ circuit fuse is open, test the relay controlled output circuit terminal for a short to ground. If the circuit tests normal, test or replace the Rear Access Panel relay. |
⇒ | If the test lamp does not illuminate, test the B+ circuit for an open/high resistance. |
• | Left rear access panel latch circuit terminal 4 |
• | Right rear access panel latch circuit terminal 9 |
⇒ | If greater than the specified range, test the control circuit for an open/high resistance. |
⇒ | If the access panel latch does not activate, test the output circuit for an open/high resistance. If the circuit tests normal, test or replace the access panel latch. |
⇒ | If the test lamp is always ON, test the control circuit for a short to ground. If the circuit tests normal, replace the BCM. |
⇒ | If the test lamp is always OFF, test the control circuit for a short to voltage or an open/high resistance. If the circuit tests normal, replace the BCM. |
• | Left rear access panel latch terminal 3 |
• | Right rear access panel latch terminal 8 |
• | Left rear access panel latch terminal 4 |
• | Right rear access panel latch terminal 9 |
⇒ | If the latch does not perform as specified, replace the rear access panel latch. |
⇒ | If not the specified value, replace the rear access panel switch. |
⇒ | If greater than the specified range, replace the rear access panel switch. |
⇒ | If not within the specified range, replace the relay. |
• | 30 and 86 |
• | 30 and 87 |
• | 30 and 85 |
• | 85 and 87 |
⇒ | If not the specified value, replace the relay. |
⇒ | If greater than the specified range, replace the relay. |
Perform the Diagnostic Repair Verification after completing the diagnostic procedure.
• | Control Module References for BCM and IPC replacement, setup and programming |