Pinpoint Test X: The Reversing Lamps Are On Continuously
Reversing Lamps
Pinpoint Tests
Pinpoint Test X: The Reversing Lamps Are On Continuously
Refer to Wiring Diagram Set 93 (Escape/Mariner, Escape Hybrid/Mariner Hybrid), Reversing Lamps for schematic and connector information. Diagrams By Number
Normal Operation
The reversing lamps relay coil ground is controlled by the PCM (automatic transaxle) or the reversing lamp switch (manual transaxle).
For vehicles with an automatic transaxle, when the transaxle is in REVERSE (R), the PCM provides ground to energize the reversing lamps relay.
For vehicles with a manual transaxle, when the transaxle is in REVERSE (R), the reversing lamps switch completes the path to ground to energize the reversing lamps relay.
When the reversing lamps relay is energized, voltage is routed to the interior rear view mirror, the Parking Aid Module (PAM) (if equipped) and the reversing lamps.
- DTC P1910 (Reverse Lamp Control Circuit/Open) - sets when the PCM detects no voltage from the reversing lamps relay coil ground control circuit (if the coil ground control circuit is short to ground).
This pinpoint test is intended to diagnose the following:
- Wiring, terminals or connectors
- Reversing lamps relay
- Reversing lamp switch (manual transaxle)
- Interior rear view mirror
- PCM (automatic transaxle)
PINPOINT TEST X: THE REVERSING LAMPS ARE ON CONTINUOUSLY
NOTICE: Use the correct probe adapter(s) when making measurements. Failure to use the correct probe adapter(s) may damage the connector.
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X1 CHECK THE REVERSING LAMPS RELAY OUTPUT
- Ignition OFF.
- Disconnect: Reversing Lamps Relay.
- Ignition ON.
- Do the reversing lamps continue to illuminate?
Yes
If equipped with an interior rear view mirror, GO to X2.
If not equipped with an interior rear view mirror, REPAIR circuit CBB07 (GN/BU) for a short to voltage. TEST the system for normal operation.
No
GO to X3.
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X2 CHECK THE REAR VIEW MIRROR
- Ignition OFF.
- Disconnect: Interior Rear View Mirror C9039, C9030 or C9012.
- Ignition ON.
- Do the reversing lamps continue to illuminate?
Yes
REPAIR circuit CBB07 (GN/BU) for a short to voltage. TEST the system for normal operation.
No
INSTALL a new interior rear view mirror. REFER to Rear View Mirrors Interior Rear View Mirror. TEST the system for normal operation.
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X3 CHECK THE REVERSING LAMPS RELAY
- Ignition OFF.
- Substitute a known good relay.
- Ignition ON.
- Do the reversing lamps continue to illuminate?
Yes
REMOVE the known good relay. GO to X4.
No
REMOVE the known good relay. INSTALL a new reversing lamps relay. TEST the system for normal operation.
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X4 CHECK THE REVERSING LAMPS RELAY COIL GROUND CONTROLLED CIRCUIT FOR A SHORT TO GROUND
- Ignition OFF.
- Connect: Reversing Lamps Relay.
- Disconnect: Reversing Lamp Switch C169 (Manual Transaxle).
- Disconnect: PCM C175t (Automatic Transaxle).
- Ignition ON.
- Do the reversing lamps continue to illuminate?
Yes
REPAIR circuit CLS28 (BU/WH) for a short to ground. TEST the system for normal operation.
No
For vehicles with an automatic transaxle, GO to X5.
For vehicles with a manual transaxle, INSTALL a new reversing lamp switch. REFER to Reversing Lamp Switch Service and Repair. TEST the system for normal operation.
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X5 CHECK FOR CORRECT PCM OPERATION
- Disconnect all the PCM connectors.
- Check for:
- corrosion
- damaged pins
- pushed-out pins
- Connect all the PCM connectors and make sure they seat correctly.
- Operate the system and verify the concern is still present.
- Is the concern still present?
Yes
INSTALL a new PCM. REFER to Electronic Engine Controls - 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.
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