Pinpoint Test G: DTC C1748

Parking Aid

Pinpoint Tests

Pinpoint Test G: DTC C1748

Refer to Wiring Diagram Set 131, Parking Aid for schematic and connector information. Diagrams By Number

Normal Operation

The parking aid system is enabled when the vehicle ignition is in RUN and REVERSE (R) is selected. When the parking aid switch is pressed the Parking Aid Module (PAM) circuit CMP18 (GN/BN) is momentarily grounded, which disables the parking aid system.

- DTC C1748 (Switch Input Circuit Short to Gnd) - sets when the PAM senses a short to ground on circuit CMP18 (GN/BN). This DTC sets in continuous memory only.

This pinpoint test is intended to diagnose the following:

- Wiring, terminals or connectors
- Parking aid switch
- PAM



PINPOINT TEST G: DTC C1748

NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.

-------------------------------------------------
G1 CHECK FOR RECORDED DTCs FROM BOTH THE CONTINUOUS AND ON-DEMAND PAM SELF-TESTS


- Check for recorded PAM DTCs from the continuous and on-demand self-tests.
- Are any PAM DTCs recorded?

Yes
For DTC C1748, GO to G2 .

No
For all other DTCs, REFER to DTC Charts. [1][2]Diagnostic Trouble Code Descriptions

-------------------------------------------------
G2 CHECK THE PARKING AID DISABLE SWITCH CIRCUIT FOR A SHORT TO GROUND


- Ignition OFF.
- Disconnect: PAM C3267.
- Measure the resistance between the PAM C3267-11, circuit CMP18 (GN/BN), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
GO to G4.

No
GO to G3.

-------------------------------------------------
G3 CHECK THE PARKING AID DISABLE SWITCH CIRCUIT FOR A SHORT TO GROUND - PARKING AID DISABLE SWITCH DISCONNECTED


- Disconnect: Parking Aid Switch C2114.
- Measure the resistance between the PAM C3267-11, circuit CMP18 (GN/BN), harness side and ground.




- Is the resistance greater than 10,000 ohms?

Yes
INSTALL a new parking aid disable switch. REFER to Parking Aid Switch Service and Repair. CLEAR the DTCs. REPEAT the self-test.

No
REPAIR the circuit. CLEAR the DTCs. REPEAT the self-test.

-------------------------------------------------
G4 CHECK FOR CORRECT PAM OPERATION


- Disconnect the PAM connector.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect the PAM connector and make sure it seats correctly.
- Operate the system and determine if the concern is still present.
- Is the concern still present?

Yes
INSTALL a new PAM. REFER to Parking Aid Module (PAM) Service and Repair. TEST the system for normal operation.

No
The system is operating correctly at this time. The concern may have been caused by a loose or corroded connector. CLEAR the DTCs. REPEAT the self-test.

-------------------------------------------------